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Risk management - Credit risk mitigation and credit quality - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | € (6,500) |
Percentage of increase (decrease) in portfolio size | (0.69%) |
Maximum exposure to credit risk | € (931,552) | € (938,061)
Industry composition percentage | 38.80% | 37.80%
Percentage of volume increase | (0.70%) |
Percentage for no covers | 95.00% |
Percentage of residential mortgage oustandings | 38.70% | 37.70%
Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | € (4,200) |
Maximum exposure to credit risk | € (213,486) | € (218,548)
Industry composition percentage | 55.00% |
Percentage of volume increase | (2.30%) |
Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (115,921) | (116,580)
Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (29,363) | (31,720)
Percentage of volume increase | (7.40%) |
Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (415,914) | (428,616)
Foreign exchange rate changes, negative impact on portfolio growth percent | (3.80%) |
Wholesale Banking | Australian Dollar |  |
Disclosure of credit risk exposure [line items] |  |
Appreciation (depreciation) in currency value | (3.40%) |
Wholesale Banking | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (54,938) | (61,143)
Wholesale Banking | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (24,171) | (27,144)
Wholesale Banking | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (23,805) | (26,113)
Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (257,211) | (253,391)
Retail Challengers & Growth Markets | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (390) | (254)
Retail Challengers & Growth Markets | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,294) | (669)
Retail Challengers & Growth Markets | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (677) | (639)
Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (253,241) | (250,056)
Retail Benelux | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (155,792) | (154,253)
Retail Benelux | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (90,450) | (88,767)
Retail Benelux | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (4,880) | (4,953)
Central Governments |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (52,621) | (49,356)
Central Governments | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,620) | (3,342)
Central Governments | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (9,046) | (7,716)
Central Governments | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (79) | (175)
Central Governments | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (45,316) | (41,622)
Central Governments | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (5,180) | (3,838)
Central Governments | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,124) | (2,880)
Non-Bank Financial Institutions |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (57,889) | (56,594)
Non-Bank Financial Institutions | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,573) | (2,710)
Non-Bank Financial Institutions | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,457) | (1,041)
Non-Bank Financial Institutions | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (4,631) | (4,489)
Non-Bank Financial Institutions | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (55,313) | (54,274)
Non-Bank Financial Institutions | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (890) | (504)
Non-Bank Financial Institutions | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,400) | (1,379)
Commercial Banks |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (46,040) | (50,862)
Commercial Banks | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,217) | (1,358)
Commercial Banks | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (404) | (265)
Commercial Banks | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (5,070) | (4,480)
Commercial Banks | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (37,342) | (42,036)
Commercial Banks | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (6,006) | (5,721)
Commercial Banks | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (177) | (194)
Central Banks |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (94,147) | (105,043)
Central Banks | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (31,017) | (35,202)
Central Banks | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (9,756) | (14,338)
Central Banks | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (4,853) | (6,820)
Central Banks | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (70,139) | (80,006)
Central Banks | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (21,740) | (23,541)
Central Banks | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk |  |
Natural Resources |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (42,394) | (46,549)
Natural Resources | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,623) | (3,084)
Natural Resources | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,346) | (1,356)
Natural Resources | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,511) | (2,764)
Natural Resources | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (40,511) | (44,695)
Natural Resources | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (624) | (694)
Natural Resources | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,259) | (1,160)
Utilities |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (25,509) | (24,698)
Utilities | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,419) | (1,551)
Utilities | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,634) | (1,630)
Utilities | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (480) | (572)
Utilities | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (23,324) | (22,683)
Utilities | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (160) | (150)
Utilities | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,024) | (1,865)
Real Estate |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (51,515) | (52,513)
Real Estate | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (16,907) | (17,586)
Real Estate | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (10,986) | (10,112)
Real Estate | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (3,563) | (3,797)
Real Estate | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (24,904) | (26,426)
Real Estate | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,936) | (3,439)
Real Estate | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (23,675) | (22,648)
Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (715,602) | € (714,997)
Rating class concentration increase or (decrease) percentage | 76.80% | 76.20%
Percentage of total outstandings | 99.00% |
Investment grade | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (170,067) | € (174,971)
Investment grade | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (71,730) | (76,244)
Investment grade | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (24,083) | € (26,053)
Investment grade | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 81.20% |
Investment grade | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 78.90% | 75.20%
Non-Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (197,949) | € (203,786)
Rating class concentration increase or (decrease) percentage | 21.20% | 21.70%
Non-Investment grade | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (40,399) | € (40,325)
Non-Investment grade | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (40,236) | (36,036)
Non-Investment grade | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (5,013) | € (5,442)
Non-Investment grade | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 17.10% | 16.80%
Non-Investment grade | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 30.30% | 28.90%
Non-performing loans |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (11,673) | € (11,708)
Rating class concentration increase or (decrease) percentage | 1.30% | 1.20%
Non-performing loans | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (1,587) | € (1,743)
Percentage of total outstandings | 0.70% | 0.80%
Non-performing loans | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (3,156) | € (3,316)
Percentage of total outstandings | 2.70% | 2.80%
Non-performing loans | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (162) | € (145)
Non-performing loans | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 1.00% |
Non-performing loans | Retail Challengers & Growth Markets |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 1.20% | 1.00%
Non-performing loans | Retail Benelux |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 1.80% | 1.90%
Investment grade and non-investment grade | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of total outstandings | 98.60% | 98.50%
Investment grade and non-investment grade | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of total outstandings | 96.60% | 96.30%
Netherlands | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustandings | 34.80% |
Germany | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustandings | 28.00% |
Belgium & Luxembourg | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustandings | 13.30% |
Australia | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustandings | 10.90% |

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