Notes - Consolidated Statement Of Income
| Concept | 
                                    
                                        2021-01-01 to 2021-12-31  | 
                            
                                
                                    
                                        2021-01-01 to 2021-12-31  | 
                            
                                
                                    
                                        2020-01-01 to 2020-12-31  | 
                            
                        
|---|---|---|---|
| Notes - Consolidated statement of income | |||
| Notes - Consolidated statement of income | |||
| Major components of selling, general and administrative expenses | — | ||
| Research and development expenses included in general and administrative expenses and manufacturing costs for period | — | — | |
| Research and development expenses included in general and administrative expenses and manufacturing costs for period | — | 
                                        
                                             
                                                1,390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Notes regarding gain on sale of property, plant and equipment | — | — | |
| Notes regarding loss on sale of property, plant and equipment | — | — | |
| Notes regarding loss on disposal of property, plant and equipment | — | — |