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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%