Statement Of Financial Position [Abstract]
| Concept | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment | 
                                                10 043
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                7 327
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Investment property | 
                                                12 795
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                12 795
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Goodwill | 
                                                2 356
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1 623
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Intangible assets other than goodwill | 
                                                18,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                4,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements | 
                                                589,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                673,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Cash and cash equivalents | 
                                                1 193
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1 737
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                1 213
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | 
| Assets | 
                                                107 500
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                101 306
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital | 
                                                35 836
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                35 836
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other reserves | 
                                                3 203
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                3 125
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity attributable to owners of parent | 
                                                51 374
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                51 410
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-controlling interests | 
                                                3 601
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1 535
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity | 
                                                54 975
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                3 336
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                3 203
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                3 601
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                9 000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                35 836
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                51 374
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                52 945
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                3 125
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1 535
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                9 000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                3 449
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                35 836
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                51 410
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1 816
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                3 125
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                19 765
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                18 277
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1 488
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                13 336
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Liabilities [abstract] | |||||||||||||||||||||
| Deferred tax liabilities | 
                                                308,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                283,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities | 
                                                52 525
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                48 361
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity and liabilities | 
                                                107 500
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                101 306
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — |