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Risk management - Credit risk mitigation and credit quality - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | € 30,300 |
Percentage of increase (decrease) in portfolio size | 3.20% |
Maximum exposure to credit risk | € (961,863) | € (931,552)
Rating class concentration increase or (decrease) percentage | 76.80% | 78.10%
Percentage for no covers | 99.00% |
Percentage of residential mortgage oustanding | 39.40% | 38.70%
Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | € 8,500 |
Maximum exposure to credit risk | (210,913) | € (213,486)
Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | 6,200 |
Maximum exposure to credit risk | (122,091) | (115,921)
Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (31,314) | (29,363)
Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (426,767) | (415,914)
Wholesale Banking | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (44,421) | (54,938)
Wholesale Banking | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (26,506) | (24,171)
Wholesale Banking | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (26,176) | (23,805)
Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (529,317) | (510,452)
Retail Banking | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (164,590) | (156,182)
Retail Banking | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (95,584) | (91,744)
Retail Banking | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (5,139) | (5,557)
Central Governments |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (56,497) | (52,621)
Central Governments | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,416) | (1,620)
Central Governments | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (11,009) | (9,046)
Central Governments | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (82) | (79)
Central Governments | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (48,389) | (45,316)
Central Governments | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (8,107) | (7,304)
Non-Bank Financial Institutions |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | 8,800 |
Maximum exposure to credit risk | (66,719) | (57,889)
Non-Bank Financial Institutions | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,872) | (2,573)
Non-Bank Financial Institutions | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,766) | (1,457)
Non-Bank Financial Institutions | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (6,031) | (4,631)
Non-Bank Financial Institutions | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (64,217) | (55,313)
Non-Bank Financial Institutions | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,212) | (2,290)
Commercial Banks |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | 5,200 |
Maximum exposure to credit risk | (51,240) | (46,040)
Commercial Banks | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,285) | (1,217)
Commercial Banks | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (314) | (404)
Commercial Banks | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (5,268) | (5,070)
Commercial Banks | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (40,962) | (37,342)
Commercial Banks | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (6,662) | (6,183)
Central Banks |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (77,919) | (94,147)
Central Banks | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (22,529) | (31,017)
Central Banks | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (10,196) | (9,756)
Central Banks | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (5,737) | (4,853)
Central Banks | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (61,091) | (70,139)
Central Banks | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (15,044) | (21,740)
Natural Resources |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (41,899) | (42,394)
Natural Resources | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,197) | (2,623)
Natural Resources | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,531) | (1,346)
Natural Resources | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,503) | (2,511)
Natural Resources | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (39,974) | (40,511)
Natural Resources | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,925) | (1,883)
Utilities |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (27,713) | (25,509)
Utilities | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,805) | (2,419)
Utilities | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (1,843) | (1,634)
Utilities | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (395) | (480)
Utilities | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (25,517) | (23,324)
Utilities | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (2,196) | (2,184)
Real Estate |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (53,381) | (51,515)
Real Estate | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (16,749) | (16,907)
Real Estate | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (13,387) | (10,986)
Real Estate | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (3,446) | (3,563)
Real Estate | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (24,643) | (24,904)
Real Estate | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | 18,900 |
Maximum exposure to credit risk | (28,738) | (26,611)
Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (750,822) | (715,602)
Investment grade | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (170,093) | (170,067)
Investment grade | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | 3,200 |
Maximum exposure to credit risk | (74,882) | (71,730)
Investment grade | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | 3,200 |
Maximum exposure to credit risk | € (27,235) | € (24,083)
Investment grade | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 83.70% | 81.20%
Investment grade | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 73.30% | 73.00%
Non-Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (191,623) | € (197,949)
Rating class concentration increase or (decrease) percentage | 21.20% | 19.90%
Non-Investment grade | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | € (2,700) |
Maximum exposure to credit risk | (37,689) | € (40,399)
Non-Investment grade | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (43,059) | (40,236)
Non-Investment grade | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) in portfolio size | (1,200) |
Maximum exposure to credit risk | € (3,858) | € (5,013)
Non-Investment grade | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 14.60% | 17.10%
Non-Investment grade | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 24.40% | 24.90%
Non-performing loans |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (13,303) | € (11,673)
Rating class concentration increase or (decrease) percentage | 1.30% | 1.40%
Non-performing loans | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (1,552) | € (1,587)
Non-performing loans | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | (3,071) | (3,156)
Non-performing loans | Luxembourg |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | € (166) | € (162)
Non-performing loans | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 1.00% | 1.20%
Non-performing loans | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Rating class concentration increase or (decrease) percentage | 1.50% |
Investment grade and non-investment grade | Netherlands |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of total outstandings | 98.50% | 98.60%
Investment grade and non-investment grade | Belgium |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of total outstandings | 96.60% | 96.60%
Netherlands | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustanding | 34.60% |
Germany | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustanding | 27.50% |
Belgium & Luxembourg | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustanding | 12.80% |
Australia | Investment grade |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of residential mortgage oustanding | 10.80% |

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