Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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As at 2020-12-31 |
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As at 2019-12-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | |||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | |||||||||||||||||||||||||||||||||
| Assets | — |
21,623,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
20,736,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | |||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | |||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | |||||||||||||||||||||||||||||||||
| Equity |
1,383,000,000
EUR
|
11,161,000,000
EUR
|
25,000,000
EUR
|
379,000,000
EUR
|
280,000,000
EUR
|
11,023,000,000
EUR
|
9,975,000,000
EUR
|
39,000,000
EUR
|
684,000,000
EUR
|
5,000,000
EUR
|
138,000,000
EUR
|
984,000,000
EUR
|
129,000,000
EUR
|
59,000,000
EUR
|
10,202,000,000
EUR
|
5,000,000
EUR
|
730,000,000
EUR
|
97,000,000
EUR
|
768,000,000
EUR
|
9,907,000,000
EUR
|
36,000,000
EUR
|
10,331,000,000
EUR
|
6,443,000,000
EUR
|
2,978,000,000
EUR
|
78,000,000
EUR
|
262,000,000
EUR
|
9,421,000,000
EUR
|
6,035,000,000
EUR
|
597,000,000
EUR
|
53,000,000
EUR
|
243,000,000
EUR
|
59,000,000
EUR
|
1,000,000
EUR
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |