Analysis Of Income And Expense [Abstract]

KBC Groupe NV - Filing #3174055

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	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	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
Analysis of income and expense [abstract]
Revenue [abstract]
Interest income	—	—	—	—	—	—	—	6 320 EUR	—	—	—	6 264 EUR	—	—	—	—	—	—
Dividend income	—	—	—	—	—	—	—	45,000,000 EUR	—	—	—	53,000,000 EUR	—	—	—	—	—	—
Revenue	—	—	—	—	—	—	—	7 558 EUR	—	—	—	7 195 EUR	—	—	—	—	—	—
Material income and expense [abstract]
Income from discontinued operations attributable to owners of parent	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—
Profit (loss) from discontinued operations attributable to non-controlling interests	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—
Interest expense	—	—	—	—	—	—	—	1 869 EUR	—	—	—	1 797 EUR	—	—	—	—	—	—
Interest income (expense)	—	—	—	—	—	—	—	4 451 EUR	—	—	—	4 467 EUR	—	—	—	—	—	—
Selling, general and administrative expense [abstract]
General and administrative expense	—	—	—	—	—	—	—	1 583 EUR	—	—	—	1 518 EUR	—	—	—	—	—	—
Operating expense	—	—	—	—	—	—	—	4 396 EUR	—	—	—	4 156 EUR	—	—	—	—	—	—
Fee and commission income (expense) [abstract]
Fee and commission income [abstract]
Fee and commission income	—	—	—	—	—	—	—	2 692 EUR	—	—	—	2 365 EUR	—	—	—	—	—	—
Fee and commission expense [abstract]
Fee and commission expense	—	—	—	—	—	—	—	856,000,000 EUR	—	—	—	755,000,000 EUR	—	—	—	—	—	—
Fee and commission income (expense)	—	—	—	—	—	—	—	1 836 EUR	—	—	—	1 609 EUR	—	—	—	—	—	—
Expenses by nature [abstract]
Classes of employee benefits expense [abstract]
Employee benefits expense	—	—	—	—	—	—	—	2 457 EUR	—	—	—	2 329 EUR	—	—	—	—	—	—
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Depreciation and amortisation expense	—	—	—	—	—	—	—	356,000,000 EUR	—	—	—	309,000,000 EUR	—	—	—	—	—	—
Impairment loss (reversal of impairment loss) recognised in profit or loss	—	—	—	—	—	—	—	261,000,000 EUR	—	—	—	1 182 EUR	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [abstract]
Disclosure of attribution of expenses by nature to their function [line items]
Miscellaneous other comprehensive income [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations	—	—	—	—	—	—	—	272,000,000 EUR	—	—	—	291,000,000 EUR	—	—	—	—	—	—
Other comprehensive income, net of tax, hedges of net investments in foreign operations	—	—	—	—	—	—	—	84,000,000 EUR	—	—	—	74,000,000 EUR	—	—	—	—	—	—
Other comprehensive income, before tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract]
Other comprehensive income, before tax, exchange differences on translation of foreign operations	—	—	—	—	—	—	—	272,000,000 EUR	—	—	—	291,000,000 EUR	—	—	—	—	—	—
Income tax relating to exchange differences on translation of foreign operations and hedges of net investments in foreign operations included in other comprehensive income [abstract]
Income tax relating to exchange differences on translation of foreign operations included in other comprehensive income	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—
Income tax relating to hedges of net investments in foreign operations included in other comprehensive income	—	—	—	—	—	—	—	28,000,000 EUR	—	—	—	21,000,000 EUR	—	—	—	—	—	—
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates and joint ventures accounted for using equity method	—	—	—	—	—	—	—	5,000,000 EUR	—	—	—	11,000,000 EUR	—	—	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [abstract]
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, net of tax	—	—	—	—	—	—	—	0 EUR	—	—	—	2,000,000 EUR	—	—	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax [abstract]
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, before tax	—	—	—	—	—	—	—	0 EUR	—	—	—	2,000,000 EUR	—	—	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—
Income tax relating to share of other comprehensive income of associates and joint ventures accounted for using equity method [abstract]
Income tax relating to share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—
Income tax relating to share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	0 EUR	0 EUR	0 EUR	0 EUR	0 EUR	403,000,000 EUR	3 015 EUR	3 015 EUR	2 612 EUR	1 440 EUR	0 EUR	1 339 EUR	0 EUR	0 EUR	1 339 EUR	0 EUR	0 EUR	102,000,000 EUR
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	3 015 EUR	—	—	—	1 339 EUR	—	—	—	—	—	—
Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract]
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	—	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—