Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
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As at 2020-12-31 |
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As at 2019-12-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | ||||||||||||||||||||||||||||||||||||
| Assets | — | — | — | — |
64,361,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
60,860,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | ||||||||||||||||||||||||||||||||||||
| Liabilities | — | — | — | — |
32,017,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
31,789,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity |
1,117,000,000
SEK
|
808,000,000
SEK
|
2,770,000,000
SEK
|
29,937,000,000
SEK
|
32,344,000,000
SEK
|
148,000,000
SEK
|
217,000,000
SEK
|
1,285,000,000
SEK
|
32,096,000,000
SEK
|
220,000,000
SEK
|
248,000,000
SEK
|
28,000,000
SEK
|
163,000,000
SEK
|
495,000,000
SEK
|
2,770,000,000
SEK
|
28,908,000,000
SEK
|
1,117,000,000
SEK
|
2,447,000,000
SEK
|
28,824,000,000
SEK
|
1,728,000,000
SEK
|
29,071,000,000
SEK
|
123,000,000
SEK
|
156,000,000
SEK
|
7,000,000
SEK
|
129,000,000
SEK
|
27,600,000,000
SEK
|
147,000,000
SEK
|
1,383,000,000
SEK
|
2,770,000,000
SEK
|
27,747,000,000
SEK
|
2,000,000
SEK
|
95,000,000
SEK
|
1,117,000,000
SEK
|
82,000,000
SEK
|
25,271,000,000
SEK
|
18,000,000
SEK
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |