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 |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||
| Equity | — |
3,847,000,000
EUR
|
3,640,000,000
EUR
|
— | — | — |
14,172,000,000
EUR
|
— |
845,000,000
EUR
|
— |
11,914,000,000
EUR
|
2,051,000,000
EUR
|
2,258,000,000
EUR
|
29,000,000
EUR
|
1,502,000,000
EUR
|
— | — |
4,143,000,000
EUR
|
2,219,000,000
EUR
|
11,555,000,000
EUR
|
1,502,000,000
EUR
|
1,141,000,000
EUR
|
— |
260,000,000
EUR
|
2,978,000,000
EUR
|
2,051,000,000
EUR
|
— | — |
13,774,000,000
EUR
|
— | — | — |
3,931,000,000
EUR
|
11,221,000,000
EUR
|
2,260,000,000
EUR
|
2,663,000,000
EUR
|
95,000,000
EUR
|
2,051,000,000
EUR
|
13,481,000,000
EUR
|
979,000,000
EUR
|
1,502,000,000
EUR
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
171,000,000
EUR
|
— | — | — | — |
845,000,000
EUR
|
— |
845,000,000
EUR
|
— | — | — | — | — | — | — |
1,016,000,000
EUR
|
1,300,000,000
EUR
|
— | — | — | — | — |
1,141,000,000
EUR
|
— | — | — | — | — | — | — |
159,000,000
EUR
|
1,141,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
85,000,000
EUR
|
219,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
183,000,000
EUR
|
— | — |
79,000,000
EUR
|
296,000,000
EUR
|
918,000,000
EUR
|
— |
845,000,000
EUR
|
— |
290,000,000
EUR
|
— | — | — | — | — |
1,101,000,000
EUR
|
1,081,000,000
EUR
|
— | — | — | — | — |
1,141,000,000
EUR
|
— | — | — |
42,000,000
EUR
|
212,000,000
EUR
|
— |
355,000,000
EUR
|
125,000,000
EUR
|
956,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Issue of equity |
2,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
EUR
|
8,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
8,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
140,000,000
EUR
|
— | — |
485,000,000
EUR
|
— |
485,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
625,000,000
EUR
|
652,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
485,000,000
EUR
|
— | — | — |
167,000,000
EUR
|
485,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity |
6,000,000
EUR
|
— | — |
20,000,000
EUR
|
— |
21,000,000
EUR
|
— | — | — |
1,000,000
EUR
|
— | — | — | — | — |
27,000,000
EUR
|
14,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
7,000,000
EUR
|
— | — | — |
7,000,000
EUR
|
7,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — | — |
52,000,000
EUR
|
— |
52,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
52,000,000
EUR
|
131,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
131,000,000
EUR
|
— | — | — | — |
131,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — |
1,000,000
EUR
|
— |
1,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
1,000,000
EUR
|
1,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
1,000,000
EUR
|
— | — | — | — |
1,000,000
EUR
|
— | — | — | — | — | — | — | — | — |