Statement Of Changes In Equity [Abstract]

mBank S.A. - Filing #6228923

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 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	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	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 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	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	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 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	—	—	12 505 247 PLN	—	1 178 753 PLN	13 717 916 PLN	—	—	1 204 388 PLN	13 716 050 PLN	1 866 PLN	—	3 424 404 PLN	169 540 PLN	—	584 501 PLN	12 501 597 PLN	- PLN	169 468 PLN	16 675 067 PLN	3 417 567 PLN	16 673 133 PLN	1 934 PLN	—	1 934 PLN	169 468 PLN	16 673 133 PLN	103 831 PLN	12 397 766 PLN	584 501 PLN	—	—	—	3 417 567 PLN	—	16 675 067 PLN	—	—	—	- PLN	12 394 775 PLN	176 710 PLN	169 401 PLN	16 153 305 PLN	2 002 PLN	3 410 417 PLN	16 151 303 PLN
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1 178 813 PLN	—	—	—	—	—	—	—	—	103 757 PLN	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1 788 889 PLN	—	—	—	—	—	—	—	—	407 791 PLN	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	60,000 PLN	- PLN	2 967 642 PLN	—	1 178 753 PLN	—	—	1 788 889 PLN	- PLN	—	—	—	- PLN	—	—	2 967 702 PLN	—	—	—	—	—	—	—	—	511 548 PLN	—	—	—	—	—	—	- PLN	103 831 PLN	407 791 PLN	—	- PLN	—	74,000 PLN	- PLN	511 622 PLN	—	—	—	—	—	—	—	—
Issue of equity	- PLN	- PLN	72,000 PLN	—	- PLN	—	—	- PLN	- PLN	—	—	—	72,000 PLN	—	—	72,000 PLN	—	—	—	—	—	—	—	—	67,000 PLN	—	—	—	—	—	—	- PLN	- PLN	- PLN	—	67,000 PLN	—	- PLN	- PLN	67,000 PLN	—	—	—	—	—	—	—	—
Increase (decrease) through other changes, equity	8,000 PLN	- PLN	- PLN	—	- PLN	—	—	- PLN	- PLN	—	—	—	- PLN	—	—	8,000 PLN	—	—	—	—	—	—	—	—	12,000 PLN	—	—	—	—	—	—	18,000 PLN	- PLN	- PLN	—	- PLN	—	6,000 PLN	- PLN	18,000 PLN	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	- PLN	3 650 PLN	10 487 PLN	—	- PLN	—	—	- PLN	6 837 PLN	—	—	—	- PLN	—	—	10 487 PLN	—	—	—	—	—	—	—	—	10 159 PLN	—	—	—	—	—	—	3 009 PLN	- PLN	- PLN	—	- PLN	—	- PLN	7 150 PLN	10 159 PLN	—	—	—	—	—	—	—	—