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Risk management - Credit risk mitigation and credit quality - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
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%