Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||
| Equity | — |
51 108
SEK
|
6 416
SEK
|
— | — |
6 698
EUR
|
59 874
SEK
|
8 633
SEK
|
2 350
SEK
|
— | — | — |
51 421
SEK
|
8 990
SEK
|
54 352
SEK
|
2 350
SEK
|
— |
581,000,000
SEK
|
— |
6 316
EUR
|
— | — | — |
54 125
SEK
|
— |
6 284
SEK
|
8 676
SEK
|
— | — |
6 023
EUR
|
45 491
SEK
|
— |
2 350
SEK
|
5 003
SEK
|
7 758
SEK
|
47 141
SEK
|
54 899
SEK
|
2 350
SEK
|
39 788
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1 190
SEK
|
— | — | — |
8 620
SEK
|
— | — | — | — |
968,000,000
EUR
|
8 620
SEK
|
1 122
EUR
|
— | — | — | — |
10 228
SEK
|
— | — | — |
1 519
SEK
|
10 228
SEK
|
— | — |
9 216
SEK
|
— | — |
9 216
SEK
|
996,000,000
SEK
|
— | — |
965,000,000
EUR
|
— | — | — | — | — | — | — |
| Other comprehensive income |
888,000,000
SEK
|
— | — |
5 834
SEK
|
5 674
SEK
|
— | — | — | — |
6 562
SEK
|
160,000,000
SEK
|
6 479
SEK
|
— | — | — | — |
61,000,000
SEK
|
— |
5 701
SEK
|
— |
839,000,000
SEK
|
5 640
SEK
|
1 267
SEK
|
— |
1 790
SEK
|
— | — |
523,000,000
SEK
|
229,000,000
SEK
|
— | — |
2 019
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income |
2 078
SEK
|
— | — |
5 834
SEK
|
14 294
SEK
|
— | — | — | — |
16 372
SEK
|
8 460
SEK
|
5 268
SEK
|
— | — | — | — |
10 289
SEK
|
— |
5 701
SEK
|
— |
680,000,000
SEK
|
4 588
SEK
|
1 267
SEK
|
— |
11 006
SEK
|
— | — |
9 739
SEK
|
1 225
SEK
|
— | — |
12 231
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
528,000,000
SEK
|
— | — | — |
4 741
SEK
|
— | — | — | — |
5 269
SEK
|
4 741
SEK
|
4 843
SEK
|
— | — | — | — |
4 390
SEK
|
— | — | — |
453,000,000
SEK
|
4 390
SEK
|
— | — |
4 038
SEK
|
— | — |
4 038
SEK
|
336,000,000
SEK
|
— | — |
4 374
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
SEK
|
— | — |
2,000,000
SEK
|
2,000,000
SEK
|
— | — |
4,000,000
SEK
|
— | — | — | — | — | — | — |
| Amount removed from reserve of cash flow hedges and included in initial cost or other carrying amount of non-financial asset (liability) or firm commitment for which fair value hedge accounting is applied | — | — | — |
1,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — |
1,000,000
SEK
|
— |
2,000,000
SEK
|
— | — | — | — | — | — |
2,000,000
SEK
|
— | — |
2,000,000
SEK
|
14,000,000
SEK
|
— |
14,000,000
SEK
|
— | — | — | — | — | — |
14,000,000
SEK
|
— | — | — | — | — | — | — |