Statement Of Cash Flows [Abstract]
| Concept |
2021-01-01 to 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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||
| Profit (loss) |
1,000,000
SEK
|
— |
10,901,000,000
SEK
|
10,900,000,000
SEK
|
9,171,000,000
SEK
|
— |
9,172,000,000
SEK
|
1,000,000
SEK
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||
| Adjustments for depreciation and amortisation expense | — | — |
3,841,000,000
SEK
|
— | — | — |
3,776,000,000
SEK
|
— | — |
| Other adjustments for non-cash items | — | — |
178,000,000
SEK
|
— | — | — |
95,000,000
SEK
|
— | — |
| Cash flows from (used in) operations | — | — |
17,638,000,000
SEK
|
— | — | — |
14,850,000,000
SEK
|
— | — |
| Interest paid, classified as operating activities | — | — |
564,000,000
SEK
|
— | — | — |
699,000,000
SEK
|
— | — |
| Interest received, classified as operating activities | — | — |
5,000,000
SEK
|
— | — | — |
5,000,000
SEK
|
— | — |
| Cash flows from (used in) operating activities | — | — |
12,456,000,000
SEK
|
— | — | — |
13,658,000,000
SEK
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — | — |
699,000,000
SEK
|
— | — | — |
1,170,000,000
SEK
|
— | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — |
2,121,000,000
SEK
|
— | — | — |
6,238,000,000
SEK
|
— | — |
| Other inflows (outflows) of cash, classified as investing activities | — | — |
43,000,000
SEK
|
— | — | — |
0
SEK
|
— | — |
| Cash flows from (used in) investing activities | — | — |
3,094,000,000
SEK
|
— | — | — |
6,741,000,000
SEK
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — | — |
–
SEK
|
— | — | — |
16,000,000
SEK
|
— | — |
| Payments to acquire or redeem entity's shares | — | — |
54,000,000
SEK
|
— | — | — |
22,000,000
SEK
|
— | — |
| Payments of lease liabilities, classified as financing activities | — | — |
1,242,000,000
SEK
|
— | — | — |
1,275,000,000
SEK
|
— | — |
| Dividends paid, classified as financing activities | — | — |
4,333,000,000
SEK
|
— | — | — |
4,277,000,000
SEK
|
— | — |
| Other inflows (outflows) of cash, classified as financing activities | — | — |
282,000,000
SEK
|
— | — | — |
1,522,000,000
SEK
|
— | — |
| Cash flows from (used in) financing activities | — | — |
7,813,000,000
SEK
|
— | — | — |
4,558,000,000
SEK
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — |
1,549,000,000
SEK
|
— | — | — |
2,359,000,000
SEK
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — |
20,000,000
SEK
|
— | — | — |
45,000,000
SEK
|
— | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — |
1,549,000,000
SEK
|
— | — | — |
2,359,000,000
SEK
|
— | — |
| Cash and cash equivalents | — |
4,325,000,000
SEK
|
— | — | — |
2,756,000,000
SEK
|
— | — |
442,000,000
SEK
|