Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
348,000,000
EUR
|
399,000,000
EUR
|
414,000,000
EUR
|
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
1,270,000,000
EUR
|
1,280,000,000
EUR
|
932,000,000
EUR
|
| Investment property [abstract] | |||
| Investment property |
2,620,000,000
EUR
|
2,754,000,000
EUR
|
2,719,000,000
EUR
|
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
6,231,000,000
EUR
|
6,450,000,000
EUR
|
6,919,000,000
EUR
|
| Categories of current financial assets [abstract] | |||
| Current financial assets at fair value through other comprehensive income [abstract] | |||
| Current financial assets measured at fair value through other comprehensive income |
110,100,000,000
EUR
|
115,061,000,000
EUR
|
149,950,000,000
EUR
|
| Current financial assets at amortised cost |
21,488,000,000
EUR
|
20,291,000,000
EUR
|
21,376,000,000
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, designated upon initial recognition or subsequently |
49,392,000,000
EUR
|
43,162,000,000
EUR
|
47,587,000,000
EUR
|
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
8,207,000,000
EUR
|
6,670,000,000
EUR
|
6,929,000,000
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 | — | — |
4,135,000,000
EUR
|
| Miscellaneous assets [abstract] | |||
| Derivative financial assets |
2,486,000,000
EUR
|
2,452,000,000
EUR
|
6,419,000,000
EUR
|
| Other assets |
5,565,000,000
EUR
|
7,413,000,000
EUR
|
3,200,000,000
EUR
|
| Borrowings, by type [abstract] | |||
| Other borrowings |
9,992,000,000
EUR
|
11,118,000,000
EUR
|
7,301,000,000
EUR
|
| Miscellaneous liabilities [abstract] | |||
| Derivative financial liabilities |
4,067,000,000
EUR
|
6,461,000,000
EUR
|
1,904,000,000
EUR
|
| Deposit liabilities | — | — | — |
| Deposits from customers [abstract] | |||
| Deposits from customers |
16,460,000,000
EUR
|
16,235,000,000
EUR
|
15,945,000,000
EUR
|
| Subordinated liabilities [abstract] | |||
| Dated subordinated liabilities |
2,680,000,000
EUR
|
2,334,000,000
EUR
|
2,356,000,000
EUR
|
| Undated subordinated liabilities |
1,416,000,000
EUR
|
1,764,000,000
EUR
|
1,764,000,000
EUR
|
| Debt instruments issued |
1,195,000,000
EUR
|
1,694,000,000
EUR
|
2,292,000,000
EUR
|
| Investment contracts liabilities |
3,621,000,000
EUR
|
3,421,000,000
EUR
|
2,698,000,000
EUR
|
| Other liabilities |
4,040,000,000
EUR
|
3,014,000,000
EUR
|
8,099,000,000
EUR
|
| Net assets (liabilities) [abstract] | |||
| Assets |
208,94 1
EUR
|
207,024,000,000
EUR
|
251,443,000,000
EUR
|
| Liabilities |
187 ,822
EUR
|
185,9 23
EUR
|
227 ,811
EUR
|
| Assets less current liabilities [abstract] |