Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity | — |
343,000,000
EUR
|
— | — |
3 290,7
EUR
|
2 767,7
EUR
|
— |
2 990,1
EUR
|
1,037,000,000
EUR
|
— |
977,000,000
EUR
|
553,000,000
EUR
|
3,006,000,000
EUR
|
— | — |
2,673,000,000
EUR
|
2 381,1
EUR
|
— |
503,000,000
EUR
|
2 467,5
EUR
|
196,000,000
EUR
|
480,000,000
EUR
|
1,037,000,000
EUR
|
2 734,8
EUR
|
— | — | — |
2 392,6
EUR
|
2,349,000,000
EUR
|
555,000,000
EUR
|
1,037,000,000
EUR
|
2 235,9
EUR
|
2 627,5
EUR
|
528,000,000
EUR
|
503,000,000
EUR
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
538,000,000
EUR
|
— |
4,538,000,000
EUR
|
4,538,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
5,076,000,000
EUR
|
3,487,000,000
EUR
|
— | — |
3,005,000,000
EUR
|
— | — | — | — | — | — | — |
482,000,000
EUR
|
3,005,000,000
EUR
|
— | — | — | — | — | — | — | — |
| Other comprehensive income |
181,000,000
EUR
|
— |
1,141,000,000
EUR
|
2,598,000,000
EUR
|
— | — |
1,457,000,000
EUR
|
— | — | — | — | — | — |
2,779,000,000
EUR
|
1,009,000,000
EUR
|
— | — |
89,000,000
EUR
|
— | — | — | — | — | — |
1,035,000,000
EUR
|
63,000,000
EUR
|
946,000,000
EUR
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
719,000,000
EUR
|
— |
5,679,000,000
EUR
|
7,136,000,000
EUR
|
— | — |
1,457,000,000
EUR
|
— | — | — | — | — | — |
7,855,000,000
EUR
|
2,478,000,000
EUR
|
— | — |
3,094,000,000
EUR
|
— | — | — | — | — | — |
1,035,000,000
EUR
|
419,000,000
EUR
|
2,059,000,000
EUR
|
— | — | — | — | — | — | — | — |
| Issue of equity | — | — | — |
50,000,000
EUR
|
— | — | — | — | — |
50,000,000
EUR
|
— | — | — |
50,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
305,000,000
EUR
|
— |
1,210,000,000
EUR
|
1,210,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
1,515,000,000
EUR
|
1,010,000,000
EUR
|
— | — |
744,000,000
EUR
|
— | — | — | — | — | — | — |
266,000,000
EUR
|
744,000,000
EUR
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity |
84,000,000
EUR
|
— |
348,000,000
EUR
|
348,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
432,000,000
EUR
|
530,000,000
EUR
|
— | — |
571,000,000
EUR
|
— | — | — | — | — | — | — |
41,000,000
EUR
|
571,000,000
EUR
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
3,000,000
EUR
|
— |
268,000,000
EUR
|
268,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
271,000,000
EUR
|
292,000,000
EUR
|
— | — |
285,000,000
EUR
|
— | — | — | — | — | — | — |
7,000,000
EUR
|
285,000,000
EUR
|
— | — | — | — | — | — | — | — |