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 |
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 |
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 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 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 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity | — |
583,000,000
NOK
|
36,000,000
NOK
|
— |
3 753
NOK
|
— | — |
3 049
NOK
|
30,000,000
NOK
|
47,000,000
NOK
|
101,000,000
NOK
|
— | — | — | — |
26,000,000
NOK
|
31,000,000
NOK
|
101,000,000
NOK
|
14,000,000
NOK
|
404,000,000
NOK
|
3 609
NOK
|
— | — | — |
4 185
NOK
|
— | — | — |
0
NOK
|
284,000,000
NOK
|
8,000,000
NOK
|
29,000,000
NOK
|
3 264
NOK
|
3 635
NOK
|
66,000,000
NOK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
6,000,000
NOK
|
— | — |
188,000,000
NOK
|
— |
0
NOK
|
0
NOK
|
— | — | — | — |
0
NOK
|
0
NOK
|
194,000,000
NOK
|
126,000,000
NOK
|
— | — | — | — | — | — |
120,000,000
NOK
|
0
NOK
|
0
NOK
|
— |
0
NOK
|
6,000,000
NOK
|
0
NOK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — |
61,000,000
NOK
|
22,000,000
NOK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — |
133,000,000
NOK
|
148,000,000
NOK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
481,000,000
NOK
|
— | — | — | — | — | — | — |
0
NOK
|
35,000,000
NOK
|
— |
0
NOK
|
0
NOK
|
446,000,000
NOK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
2,000,000
NOK
|
— | — |
9,000,000
NOK
|
— |
0
NOK
|
0
NOK
|
— | — | — | — |
0
NOK
|
0
NOK
|
11,000,000
NOK
|
20,000,000
NOK
|
— | — | — | — | — | — |
0
NOK
|
0
NOK
|
0
NOK
|
— |
0
NOK
|
20,000,000
NOK
|
0
NOK
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
0
NOK
|
— | — |
0
NOK
|
— |
0
NOK
|
0
NOK
|
— | — | — | — |
0
NOK
|
5,000,000
NOK
|
5,000,000
NOK
|
2,000,000
NOK
|
— | — | — | — | — | — |
0
NOK
|
2,000,000
NOK
|
0
NOK
|
— |
0
NOK
|
0
NOK
|
0
NOK
|
— | — | — | — | — | — | — |