Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2021-12-31 |
|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||
| Property, plant and equipment [abstract] | ||||
| Property, plant and equipment |
800,000,000
EUR
|
802,000,000
EUR
|
820,000,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets and goodwill |
1,408,000,000
EUR
|
1,276,000,000
EUR
|
852,000,000
EUR
|
— |
| Investment property [abstract] | ||||
| Investment property |
793,000,000
EUR
|
883,000,000
EUR
|
992,000,000
EUR
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||||
| Investments in joint ventures reported in separate financial statements |
79,000,000
EUR
|
82,000,000
EUR
|
57,000,000
EUR
|
— |
| Investments in associates reported in separate financial statements |
108,000,000
EUR
|
83,000,000
EUR
|
59,000,000
EUR
|
— |
| Categories of financial assets [abstract] | ||||
| Financial assets at fair value through profit or loss [abstract] | ||||
| Financial assets at fair value through profit or loss, mandatorily measured at fair value | — | — | — | — |
| Financial assets at fair value through profit or loss, classified as held for trading |
72,000,000
EUR
|
–
EUR
|
20,000,000
EUR
|
— |
| Financial assets at fair value through profit or loss |
20,899,000,000
EUR
|
18,553,000,000
EUR
|
20,078,000,000
EUR
|
— |
| Financial assets at fair value through other comprehensive income [abstract] | ||||
| Financial assets at fair value through other comprehensive income |
3,968,000,000
EUR
|
4,254,000,000
EUR
|
9,457,000,000
EUR
|
— |
| Cash and cash equivalents [abstract] | ||||
| Cash and cash equivalents |
33,641,000,000
EUR
|
39,842,000,000
EUR
|
— |
33,931,000,000
EUR
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | ||||
| Non-current assets or disposal groups classified as held for sale |
–
EUR
|
2,000,000
EUR
|
5,000,000
EUR
|
— |
| Miscellaneous assets [abstract] | ||||
| Net defined benefit asset |
692,000,000
EUR
|
736,000,000
EUR
|
740,000,000
EUR
|
— |
| Derivative financial assets |
4,341,000,000
EUR
|
5,138,000,000
EUR
|
1,571,000,000
EUR
|
— |
| Debt instruments held [abstract] | ||||
| Debt instruments held |
5,715,000,000
EUR
|
4,472,000,000
EUR
|
6,008,000,000
EUR
|
— |
| Loans and advances | — | — | — | — |
| Loans and advances to banks |
1,907,000,000
EUR
|
3,044,000,000
EUR
|
2,750,000,000
EUR
|
— |
| Loans and advances to customers |
79,729,000,000
EUR
|
71,961,000,000
EUR
|
76,422,000,000
EUR
|
— |
| Cash and bank balances at central banks |
31,843,000,000
EUR
|
36,855,000,000
EUR
|
31,360,000,000
EUR
|
— |
| Items in course of collection from other banks |
126,000,000
EUR
|
140,000,000
EUR
|
159,000,000
EUR
|
— |
| Other assets |
1,127,000,000
EUR
|
769,000,000
EUR
|
776,000,000
EUR
|
— |
| Miscellaneous liabilities [abstract] | ||||
| Net defined benefit liability |
10,000,000
EUR
|
36,000,000
EUR
|
142,000,000
EUR
|
— |
| Derivative financial liabilities |
4,490,000,000
EUR
|
6,526,000,000
EUR
|
2,185,000,000
EUR
|
— |
| Deposit liabilities | — | — | — | — |
| Deposits from banks |
3,095,000,000
EUR
|
3,445,000,000
EUR
|
12,946,000,000
EUR
|
— |
| Deposits from customers [abstract] | ||||
| Deposits from customers |
100,183,000,000
EUR
|
99,200,000,000
EUR
|
92,774,000,000
EUR
|
— |
| Subordinated liabilities [abstract] | ||||
| Subordinated liabilities |
1,600,000,000
EUR
|
1,656,000,000
EUR
|
1,981,000,000
EUR
|
— |
| Debt instruments issued |
8,670,000,000
EUR
|
7,774,000,000
EUR
|
8,483,000,000
EUR
|
— |
| Investment contracts liabilities |
7,692,000,000
EUR
|
6,859,000,000
EUR
|
7,860,000,000
EUR
|
— |
| Items in course of transmission to other banks |
322,000,000
EUR
|
232,000,000
EUR
|
207,000,000
EUR
|
— |
| Other liabilities |
2,480,000,000
EUR
|
2,250,000,000
EUR
|
2,087,000,000
EUR
|
— |
| Issued capital [abstract] | ||||
| Issued capital |
1,057,000,000
EUR
|
1,070,000,000
EUR
|
1,079,000,000
EUR
|
— |
| Retained earnings [abstract] | ||||
| Retained earnings |
10,285,000,000
EUR
|
9,230,000,000
EUR
|
8,471,000,000
EUR
|
— |
| Miscellaneous equity [abstract] | ||||
| Merger reserve |
17,000,000
EUR
|
17,000,000
EUR
|
— | — |
| Net assets (liabilities) [abstract] | ||||
| Assets |
155,708,000,000
EUR
|
150,689,000,000
EUR
|
154,758,000,000
EUR
|
— |
| Liabilities |
143,147,000,000
EUR
|
139,167,000,000
EUR
|
143,791,000,000
EUR
|
— |
| Assets less current liabilities [abstract] |