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 |
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 |
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 |
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 |
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 | — |
5 336,1
EUR
|
— |
5 720,3
EUR
|
— | — |
676,000,000
EUR
|
5 716,5
EUR
|
38,000,000
EUR
|
— |
6,218,000,000
EUR
|
1 069,8
EUR
|
— | — | — |
4 881,2
EUR
|
102,000,000
EUR
|
— |
4 895,8
EUR
|
1 069,8
EUR
|
— |
929,000,000
EUR
|
9,623,000,000
EUR
|
— |
4 906,0
EUR
|
— | — | — |
5 102,2
EUR
|
99,000,000
EUR
|
892,000,000
EUR
|
4,535,000,000
EUR
|
5 112,1
EUR
|
4 575,8
EUR
|
1 069,1
EUR
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
6,000,000
EUR
|
— |
9,045,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
9,051,000,000
EUR
|
9,045,000,000
EUR
|
6,820,000,000
EUR
|
— | — | — | — | — |
6,812,000,000
EUR
|
— | — | — | — | — |
8,000,000
EUR
|
6,812,000,000
EUR
|
— | — | — | — | — | — | — |
| Other comprehensive income |
2,000,000
EUR
|
— |
3,787,000,000
EUR
|
— |
253,000,000
EUR
|
3,405,000,000
EUR
|
— | — | — | — | — | — |
3,789,000,000
EUR
|
129,000,000
EUR
|
5,245,000,000
EUR
|
— | — |
37,000,000
EUR
|
— | — |
119,000,000
EUR
|
— | — | — | — |
5,088,000,000
EUR
|
1,000,000
EUR
|
5,244,000,000
EUR
|
— | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — |
1 284,0
EUR
|
— |
1,575,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — |
0
EUR
|
— | — | — | — | — | — |
0
EUR
|
— | — |
0
EUR
|
0
EUR
|
92,000,000
EUR
|
— | — | — | — | — |
75,000,000
EUR
|
— | — |
17,000,000
EUR
|
— | — | — |
92,000,000
EUR
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
0
EUR
|
— |
3,779,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
3,779,000,000
EUR
|
3,779,000,000
EUR
|
3,586,000,000
EUR
|
— | — | — | — | — |
3,574,000,000
EUR
|
— | — | — | — | — |
12,000,000
EUR
|
3,574,000,000
EUR
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — |
917,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
917,000,000
EUR
|
917,000,000
EUR
|
162,000,000
EUR
|
— | — | — | — | — |
162,000,000
EUR
|
— | — | — | — | — | — |
162,000,000
EUR
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
72,000,000
EUR
|
— |
228,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
300,000,000
EUR
|
228,000,000
EUR
|
37,000,000
EUR
|
— | — | — | — | — |
45,000,000
EUR
|
— | — | — | — | — |
8,000,000
EUR
|
45,000,000
EUR
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — |
305,000,000
EUR
|
— | — | — | — | — | — | — | — | — |
305,000,000
EUR
|
305,000,000
EUR
|
223,000,000
EUR
|
— | — | — | — | — |
223,000,000
EUR
|
— | — | — | — | — | — |
223,000,000
EUR
|
— | — | — | — | — | — | — |