Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||
| Statement of changes in equity [line items] | ||||||||||
| Increase (decrease) through transactions with owners, equity |
17, 8
NOK
|
0, 1
NOK
|
1,516,000,000
NOK
|
6,754,300
NOK
|
6,923,600
NOK
|
6,138,600
NOK
|
6,171,000
NOK
|
133,000,000
NOK
|
458,000,000
NOK
|
0
NOK
|
| Purchase of treasury shares | — |
1,000,000
NOK
|
— |
234,000,000
NOK
|
234,000,000
NOK
|
131,000,000
NOK
|
130,000,000
NOK
|
— | — |
0
NOK
|