Statement Of Changes In Equity [Abstract]

Gjensidige Forsikring ASA - Filing #2621067

Concept	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	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	As at 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	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	25.205, 2 NOK	—	—	—	—	—	—	—	—	—	—	—	25.284, 5 NOK	—	2,058,100 NOK	5,659,000,000 NOK	1,002,300 NOK	1,430,000 NOK	26,191,600 NOK	24,182,100 NOK	695,000,000 NOK	0 NOK	1.000, 0 NOK
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	—	—	—	—	7,141,100 NOK	—	4. 953,9 NOK	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	5,000,000 NOK	1,128,000,000 NOK	3,535,000,000 NOK	—	4,661,000,000 NOK	8,000,000 NOK	2,835,000,000 NOK	841,000,000 NOK	14,000,000 NOK	5,000,000 NOK	—	—	3,686,000,000 NOK	—	—	—	—	—	—	—	—	—
Comprehensive income	—	5,000,000 NOK	1,128,000,000 NOK	353, 5 NOK	513,000,000 NOK	6,675,000 NOK	7,090,500 NOK	5,237,300 NOK	84, 1 NOK	4,906,600 NOK	5,000,000 NOK	458,000,000 NOK	—	3,686,000,000 NOK	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	—	—	—	—	6,899,500 NOK	6,899,500 NOK	6,124,900 NOK	—	6,124,900 NOK	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through other changes, equity	—	—	—	—	—	—	—	25, 9 NOK	—	259,000,000 NOK	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	178,000,000 NOK	—	—	—	178,000,000 NOK	—	133,000,000 NOK	—	—	133,000,000 NOK	—	—	—	—	—	—	—	—	—	—	—	—