Statement Of Changes In Equity [Abstract]

DNB Bank ASA - Filing #2618703

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	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	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	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	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	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	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	183 071 NOK	243 912 NOK	—	19 379 NOK	16 974 NOK	5 444 NOK	45,000,000 NOK	—	—	266,000,000 NOK	18 733 NOK	—	—	—	185 829 NOK	11 9 NOK	—	23,000,000 NOK	15 503 NOK	18 362 NOK	5 952 NOK	22 609 NOK	—	—	248 396 NOK	—	—	45,000,000 NOK	22 609 NOK	242 255 NOK	172 297 NOK	2,000,000 NOK	15 706 NOK	4 872 NOK	26 729 NOK
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	26,000,000 NOK	—	—	—	—	—	—	—	922,000,000 NOK	—	—	—	25 355 NOK	24 407 NOK	19 840 NOK	—	—	18 712 NOK	—	—	—	—	—	1 143 NOK	—	—	15,000,000 NOK	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	—	—	—	—	—	—	681,000,000 NOK	—	943,000,000 NOK	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	27,000,000 NOK	—	—	22,000,000 NOK	—	—	—	—	922,000,000 NOK	509,000,000 NOK	—	—	24 674 NOK	24 212 NOK	20 783 NOK	—	—	18 545 NOK	—	—	—	—	—	1 143 NOK	1 081 NOK	—	1 1 NOK	25,000,000 NOK	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	120,000,000 NOK	—	—	—	—	—	—	—	—	—	—	—	11 7 NOK	3,000,000 NOK	86,000,000 NOK	—	—	—	—	—	—	—	—	—	—	—	86,000,000 NOK	—	—	—	—	—	—	—	—	—