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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||
| Assets [abstract] | ||||||||||||
| Non-current assets [abstract] | ||||||||||||
| Property, plant and equipment | — | — | — |
663,000,000
SEK
|
510,000,000
SEK
|
— | — | — | — | — | — | — |
| Right-of-use assets | — | — | — |
7,279,000,000
SEK
|
7,110,000,000
SEK
|
— | — | — | — | — | — | — |
| Investment property | — | — | — |
46 742,8
SEK
|
49 546,9
SEK
|
— | — | — | — | — | — | — |
| Other non-current financial assets | — | — | — |
227,000,000
SEK
|
251,000,000
SEK
|
— | — | — | — | — | — | — |
| Non-current assets | — | — | — |
47 654,2
SEK
|
50 423,3
SEK
|
— | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||
| Cash and cash equivalents | — | — | — |
3,824,000,000
SEK
|
4,530,000,000
SEK
|
— | — | — |
1 182,0
SEK
|
— | — | — |
| Current assets | — | — | — |
7,894,000,000
SEK
|
8,121,000,000
SEK
|
— | — | — | — | — | — | — |
| Assets | — | — | — |
48 443,6
SEK
|
51 235,4
SEK
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||
| Equity [abstract] | ||||||||||||
| Issued capital | — | — | — |
1 056,4
SEK
|
1 056,4
SEK
|
— | — | — | — | — | — | — |
| Retained earnings | — | — | — |
27 104,1
SEK
|
29 577,5
SEK
|
— | — | — | — | — | — | — |
| Equity |
1 056,4
SEK
|
27 104,1
SEK
|
6,281,000,000
SEK
|
28 788,6
SEK
|
31 262,0
SEK
|
29 577,5
SEK
|
1 056,4
SEK
|
6,281,000,000
SEK
|
31 066,0
SEK
|
29 381,5
SEK
|
6,281,000,000
SEK
|
1 056,4
SEK
|
| Liabilities [abstract] | ||||||||||||
| Non-current liabilities [abstract] | ||||||||||||
| Non-current provisions [abstract] | ||||||||||||
| Non-current provisions for employee benefits | — | — | — |
287,000,000
SEK
|
317,000,000
SEK
|
— | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — |
8 574,8
SEK
|
9 253,2
SEK
|
— | — | — | — | — | — | — |
| Non-current liabilities | — | — | — |
16 724,2
SEK
|
16 591,7
SEK
|
— | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||
| Current tax liabilities, current | — | — | — |
151,000,000
SEK
|
273,000,000
SEK
|
— | — | — | — | — | — | — |
| Current liabilities | — | — | — |
2 930,8
SEK
|
3 381,7
SEK
|
— | — | — | — | — | — | — |
| Liabilities | — | — | — |
19 655,0
SEK
|
19 973,4
SEK
|
— | — | — | — | — | — | — |
| Equity and liabilities | — | — | — |
48 443,6
SEK
|
51 235,4
SEK
|
— | — | — | — | — | — | — |