Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 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 |
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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||
| Increase (decrease) through transactions with owners, equity |
248,000,000
EUR
|
27,000,000
EUR
|
141,000,000
EUR
|
—
EUR
|
2,808,000,000
EUR
|
3,056,000,000
EUR
|
2,922,000,000
EUR
|
3,010,000,000
EUR
|
3,067,000,000
EUR
|
37,000,000
EUR
|
3,104,000,000
EUR
|
359,000,000
EUR
|
167,000,000
EUR
|
98,000,000
EUR
|
| Purchase of treasury shares | — |
135,000,000
EUR
|
— | — |
135,000,000
EUR
|
135,000,000
EUR
|
— | — |
344,000,000
EUR
|
— |
344,000,000
EUR
|
— | — |
344,000,000
EUR
|
| Cancellation of treasury shares | — | — | — | — | — | — | — | — |
—
EUR
|
— | — |
355,000,000
EUR
|
— |
355,000,000
EUR
|