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 |
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 |
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 |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity | — |
1 116,8
EUR
|
— |
2 942,8
EUR
|
— | — |
2 942,8
EUR
|
–
EUR
|
1 763,9
EUR
|
527,000,000
EUR
|
94,000,000
EUR
|
— | — | — | — |
4,290,000,000
EUR
|
–
EUR
|
1 262,8
EUR
|
91,000,000
EUR
|
— |
128,000,000
EUR
|
8,374,000,000
EUR
|
— |
1 262,8
EUR
|
— | — | — | — |
1 081,8
EUR
|
–
EUR
|
66,000,000
EUR
|
1 081,8
EUR
|
8,374,000,000
EUR
|
2,419,000,000
EUR
|
91,000,000
EUR
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
9,094,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
9,094,000,000
EUR
|
9,094,000,000
EUR
|
3,793,000,000
EUR
|
— | — | — | — |
3,793,000,000
EUR
|
— | — | — | — | — | — | — |
3,793,000,000
EUR
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — |
655,000,000
EUR
|
— | — |
655,000,000
EUR
|
— | — | — | — | — | — |
655,000,000
EUR
|
— |
61,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
61,000,000
EUR
|
— | — |
61,000,000
EUR
|
— | — | — | — | — | — | — |
| Comprehensive income |
–
EUR
|
— |
9,750,000,000
EUR
|
— |
–
EUR
|
655,000,000
EUR
|
— | — | — | — | — |
–
EUR
|
9,750,000,000
EUR
|
9,094,000,000
EUR
|
3,732,000,000
EUR
|
— | — | — | — |
3,793,000,000
EUR
|
— | — |
–
EUR
|
— |
61,000,000
EUR
|
–
EUR
|
–
EUR
|
3,732,000,000
EUR
|
— | — | — | — | — | — | — |
| Issue of equity | — | — |
9,269,000,000
EUR
|
— |
9,266,000,000
EUR
|
— | — | — | — | — | — |
3,000,000
EUR
|
9,269,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — |
123,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
123,000,000
EUR
|
123,000,000
EUR
|
46,000,000
EUR
|
— | — | — | — |
46,000,000
EUR
|
— | — | — | — | — | — | — |
46,000,000
EUR
|
— | — | — | — | — | — | — |