Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2021-01-01 to 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 |
As at 2021-12-31 |
As at 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 |
2021-01-01 to 2021-12-31 |
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 |
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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 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 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
247,000,000
EUR
|
2,330,000,000
EUR
|
— |
2,417,000,000
EUR
|
— | — | — |
118,000,000
EUR
|
122,000,000
EUR
|
2,417,000,000
EUR
|
87,000,000
EUR
|
0
EUR
|
219,000,000
EUR
|
32,000,000
EUR
|
— | — | — |
2,308,000,000
EUR
|
0
EUR
|
2,087,000,000
EUR
|
32,000,000
EUR
|
— |
133,000,000
EUR
|
116,000,000
EUR
|
222,000,000
EUR
|
135,000,000
EUR
|
87,000,000
EUR
|
— | — |
2,087,000,000
EUR
|
— | — | — |
2,380,000,000
EUR
|
0
EUR
|
213,000,000
EUR
|
87,000,000
EUR
|
2,380,000,000
EUR
|
2,297,000,000
EUR
|
279,000,000
EUR
|
139,000,000
EUR
|
110,000,000
EUR
|
33,000,000
EUR
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
0
EUR
|
— | — |
728,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — |
728,000,000
EUR
|
728,000,000
EUR
|
721,000,000
EUR
|
— | — | — | — |
721,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
0
EUR
|
721,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
1,000,000
EUR
|
— | — |
360,000,000
EUR
|
— | — |
6,000,000
EUR
|
354,000,000
EUR
|
— | — | — | — | — | — | — |
361,000,000
EUR
|
12,000,000
EUR
|
354,000,000
EUR
|
— | — | — | — |
0
EUR
|
— | — | — | — | — | — |
6,000,000
EUR
|
— |
348,000,000
EUR
|
0
EUR
|
354,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
1,000,000
EUR
|
— | — |
1,088,000,000
EUR
|
— | — |
6,000,000
EUR
|
354,000,000
EUR
|
— | — | — | — | — | — | — |
1,089,000,000
EUR
|
740,000,000
EUR
|
367,000,000
EUR
|
— | — | — | — |
721,000,000
EUR
|
— | — | — | — | — | — |
6,000,000
EUR
|
— |
348,000,000
EUR
|
0
EUR
|
367,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — |
0
EUR
|
— |
15,000,000
EUR
|
— |
0
EUR
|
— | — | — | — | — | — | — |
0
EUR
|
15,000,000
EUR
|
0
EUR
|
— | — | — | — |
6,000,000
EUR
|
— | — | — | — | — |
6,000,000
EUR
|
— | — |
0
EUR
|
— |
0
EUR
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — |
24,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — |
24,000,000
EUR
|
24,000,000
EUR
|
24,000,000
EUR
|
— | — | — | — |
24,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — |
24,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — |