Risk management - Credit risk mitigation and credit quality - Additional information (Details) - EUR (€)
€ in Millions |
12 Months Ended |
Dec. 31, 2025 |
Dec. 31, 2024 |
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
€ 41,100
|
|
| Percentage of increase (decrease) in portfolio size |
4.30%
|
|
| Maximum exposure to credit risk |
€ (1,002,947)
|
€ (961,863)
|
| Foreign exchange rate changes, negative impact on portfolio growth amount |
€ 22,000
|
|
| Rating class concentration increase or (decrease) percentage |
78.10%
|
79.30%
|
| Percentage for no covers |
99.60%
|
|
| Percentage of residential mortgage oustanding |
40.60%
|
39.40%
|
| Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
€ 4,800
|
|
| Maximum exposure to credit risk |
(215,720)
|
€ (210,913)
|
| Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(124,841)
|
(122,091)
|
| Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(33,431)
|
(31,314)
|
| Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(431,214)
|
(426,767)
|
| Foreign exchange rate changes, negative impact on portfolio growth amount |
16,600
|
|
| Wholesale Banking | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(35,165)
|
(44,421)
|
| Wholesale Banking | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(25,786)
|
(26,506)
|
| Wholesale Banking | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(28,844)
|
(26,176)
|
| Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(567,764)
|
(529,317)
|
| Retail Banking | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(180,030)
|
(164,590)
|
| Retail Banking | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(99,055)
|
(95,584)
|
| Retail Banking | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(4,587)
|
(5,139)
|
| Central Governments |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
13,400
|
|
| Maximum exposure to credit risk |
(69,880)
|
(56,497)
|
| Central Governments | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(3,297)
|
(1,416)
|
| Central Governments | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(14,525)
|
(11,009)
|
| Central Governments | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(186)
|
(82)
|
| Central Governments | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(59,600)
|
(48,389)
|
| Central Governments | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(10,280)
|
(8,107)
|
| Non-Bank Financial Institutions |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(67,271)
|
(66,719)
|
| Non-Bank Financial Institutions | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(3,577)
|
(2,872)
|
| Non-Bank Financial Institutions | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(1,536)
|
(1,766)
|
| Non-Bank Financial Institutions | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(6,819)
|
(6,031)
|
| Non-Bank Financial Institutions | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(65,037)
|
(64,217)
|
| Non-Bank Financial Institutions | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(1,973)
|
(2,212)
|
| Commercial Banks |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(54,501)
|
(51,240)
|
| Commercial Banks | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(1,482)
|
(1,285)
|
| Commercial Banks | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(504)
|
(314)
|
| Commercial Banks | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(6,808)
|
(5,268)
|
| Commercial Banks | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(44,512)
|
(40,962)
|
| Commercial Banks | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(6,351)
|
(6,662)
|
| Central Banks |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
(21,900)
|
|
| Maximum exposure to credit risk |
(55,983)
|
(77,919)
|
| Central Banks | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
(13,800)
|
|
| Maximum exposure to credit risk |
(8,742)
|
(22,529)
|
| Central Banks | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
(3,600)
|
|
| Maximum exposure to credit risk |
(6,621)
|
(10,196)
|
| Central Banks | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(6,088)
|
(5,737)
|
| Central Banks | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(40,270)
|
(61,091)
|
| Central Banks | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(15,713)
|
(15,044)
|
| Natural Resources |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(40,985)
|
(41,899)
|
| Natural Resources | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(2,220)
|
(2,197)
|
| Natural Resources | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(1,257)
|
(1,531)
|
| Natural Resources | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(2,254)
|
(2,503)
|
| Natural Resources | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(39,229)
|
(39,974)
|
| Natural Resources | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(1,757)
|
(1,925)
|
| Utilities |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(28,809)
|
(27,713)
|
| Utilities | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(1,678)
|
(1,805)
|
| Utilities | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(1,868)
|
(1,843)
|
| Utilities | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(539)
|
(395)
|
| Utilities | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(26,378)
|
(25,517)
|
| Utilities | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(2,431)
|
(2,196)
|
| Real Estate |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(54,689)
|
(53,381)
|
| Real Estate | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(17,212)
|
(16,749)
|
| Real Estate | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(14,082)
|
(13,387)
|
| Real Estate | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(3,257)
|
(3,446)
|
| Real Estate | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
4,400
|
|
| Maximum exposure to credit risk |
(25,024)
|
(24,643)
|
| Real Estate | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Increase (decrease) in portfolio size |
38,400
|
|
| Maximum exposure to credit risk |
(29,665)
|
(28,738)
|
| Investment grade |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(795,507)
|
(750,822)
|
| Investment grade | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(171,615)
|
(170,093)
|
| Investment grade | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(74,908)
|
(74,882)
|
| Investment grade | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
€ (29,551)
|
€ (27,235)
|
| Investment grade | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Rating class concentration increase or (decrease) percentage |
84.30%
|
83.70%
|
| Investment grade | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Rating class concentration increase or (decrease) percentage |
75.40%
|
73.30%
|
| Non-investment grade |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
€ (187,976)
|
€ (191,623)
|
| Rating class concentration increase or (decrease) percentage |
19.90%
|
18.70%
|
| Non-investment grade | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
€ (40,889)
|
€ (37,689)
|
| Non-investment grade | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(45,899)
|
(43,059)
|
| Non-investment grade | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
€ (3,586)
|
€ (3,858)
|
| Non-investment grade | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Rating class concentration increase or (decrease) percentage |
13.90%
|
14.60%
|
| Non-investment grade | Retail Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Rating class concentration increase or (decrease) percentage |
22.50%
|
24.40%
|
| Non-performing loans |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
€ (12,995)
|
€ (13,303)
|
| Rating class concentration increase or (decrease) percentage |
1.40%
|
1.30%
|
| Non-performing loans | Netherlands |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
€ (1,689)
|
€ (1,552)
|
| Non-performing loans | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
(3,107)
|
(3,071)
|
| Non-performing loans | Luxembourg |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Maximum exposure to credit risk |
€ (242)
|
€ (166)
|
| Non-performing loans | Wholesale Banking |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Rating class concentration increase or (decrease) percentage |
1.20%
|
1.10%
|
| 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%
|
98.50%
|
| Investment grade and non-investment grade | Belgium |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Percentage of total outstandings |
96.80%
|
96.60%
|
| Netherlands | Investment grade |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Percentage of residential mortgage oustanding |
35.00%
|
35.00%
|
| Germany | Investment grade |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Percentage of residential mortgage oustanding |
27.00%
|
27.30%
|
| Belgium & Luxembourg | Investment grade |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Percentage of residential mortgage oustanding |
12.00%
|
12.20%
|
| Australia | Investment grade |
|
|
| Disclosure of credit risk exposure [line items] |
|
|
| Percentage of residential mortgage oustanding |
10.90%
|
10.60%
|