Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2021-01-01 to 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 |
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 |
As at 2020-12-31 |
2020-01-01 to 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 |
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 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||
| Equity |
126,000,000
EUR
|
— |
491,000,000
EUR
|
— | — |
2,597,000,000
EUR
|
— |
2,000,000
EUR
|
— |
2,459,000,000
EUR
|
2,174,000,000
EUR
|
138,000,000
EUR
|
80,000,000
EUR
|
1,000,000
EUR
|
— | — | — |
387,000,000
EUR
|
124,000,000
EUR
|
17,000,000
EUR
|
2,196,000,000
EUR
|
1,000,000
EUR
|
— | — |
74,000,000
EUR
|
337,000,000
EUR
|
2,201,000,000
EUR
|
2,321,000,000
EUR
|
— | — | — | — |
2,181,000,000
EUR
|
142,000,000
EUR
|
7,000,000
EUR
|
2,195,000,000
EUR
|
2,324,000,000
EUR
|
53,000,000
EUR
|
68,000,000
EUR
|
7,000,000
EUR
|
1,000,000
EUR
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
9,000,000
EUR
|
— | — |
397,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
407,000,000
EUR
|
397,000,000
EUR
|
335,000,000
EUR
|
— | — | — | — | — |
325,000,000
EUR
|
— | — | — | — | — | — |
9,000,000
EUR
|
— |
325,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
12,000,000
EUR
|
— |
20,000,000
EUR
|
253,000,000
EUR
|
— | — | — |
257,000,000
EUR
|
— | — | — | — | — |
265,000,000
EUR
|
16,000,000
EUR
|
318,000,000
EUR
|
— | — | — | — | — |
11,000,000
EUR
|
24,000,000
EUR
|
— | — | — | — |
343,000,000
EUR
|
9,000,000
EUR
|
— |
309,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
22,000,000
EUR
|
— |
20,000,000
EUR
|
650,000,000
EUR
|
— | — | — |
257,000,000
EUR
|
— | — | — | — | — |
671,000,000
EUR
|
413,000,000
EUR
|
17,000,000
EUR
|
— | — | — | — | — |
336,000,000
EUR
|
24,000,000
EUR
|
— | — | — | — |
343,000,000
EUR
|
1,000,000
EUR
|
— |
16,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
8,000,000
EUR
|
— | — |
343,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
351,000,000
EUR
|
343,000,000
EUR
|
20,000,000
EUR
|
— | — | — | — | — |
—
EUR
|
— | — | — | — | — | — |
20,000,000
EUR
|
— |
—
EUR
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — |
—
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — |
—
EUR
|
— |
1,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — |
31,000,000
EUR
|
— |
31,000,000
EUR
|
— | — | — | — | — | — | — |
31,000,000
EUR
|
— |
34,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
34,000,000
EUR
|
34,000,000
EUR
|
— | — | — | — | — | — | — | — | — |