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 |
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 |
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 |
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 |
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 | — |
88,000,000
EUR
|
— | — | — | — | — |
2 825
EUR
|
5 213
EUR
|
3 306
EUR
|
12,789,000,000
EUR
|
— |
112,000,000
EUR
|
11,144,000,000
EUR
|
1 645
EUR
|
— | — |
1 471
EUR
|
2 771
EUR
|
4 727
EUR
|
3 256
EUR
|
10,401,000,000
EUR
|
353,000,000
EUR
|
— |
11,872,000,000
EUR
|
— | — | — |
2 749
EUR
|
2 737
EUR
|
5 146
EUR
|
10,461,000,000
EUR
|
1 403
EUR
|
11,864,000,000
EUR
|
171,000,000
EUR
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
180,000,000
EUR
|
— | — | — |
1 125
EUR
|
— |
1 125
EUR
|
— | — | — | — | — | — | — | — |
1 305
EUR
|
770,000,000
EUR
|
— | — | — | — | — | — | — | — |
74,000,000
EUR
|
696,000,000
EUR
|
696,000,000
EUR
|
— | — | — | — | — | — | — |
| Other comprehensive income |
12,000,000
EUR
|
— | — | — | — | — |
241,000,000
EUR
|
— | — | — | — |
241,000,000
EUR
|
— | — | — |
253,000,000
EUR
|
197,000,000
EUR
|
— | — | — | — | — | — |
182,000,000
EUR
|
— |
15,000,000
EUR
|
182,000,000
EUR
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
192,000,000
EUR
|
— | — | — |
1 125
EUR
|
— |
1 366
EUR
|
— | — | — | — |
241,000,000
EUR
|
— | — | — |
1 558
EUR
|
573,000,000
EUR
|
— | — | — | — | — | — |
182,000,000
EUR
|
— |
59,000,000
EUR
|
514,000,000
EUR
|
696,000,000
EUR
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
91,000,000
EUR
|
— | — | — |
647,000,000
EUR
|
— |
647,000,000
EUR
|
— | — | — | — | — | — | — | — |
738,000,000
EUR
|
687,000,000
EUR
|
— | — | — | — | — | — | — | — |
41,000,000
EUR
|
646,000,000
EUR
|
646,000,000
EUR
|
— | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity |
72,000,000
EUR
|
— | — |
1,000,000
EUR
|
56,000,000
EUR
|
1,000,000
EUR
|
56,000,000
EUR
|
— | — | — | — | — | — | — | — |
128,000,000
EUR
|
111,000,000
EUR
|
— | — | — | — | — | — | — | — |
52,000,000
EUR
|
59,000,000
EUR
|
59,000,000
EUR
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — |
88,000,000
EUR
|
— |
5,000,000
EUR
|
— |
93,000,000
EUR
|
— | — | — | — | — | — | — | — |
93,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — |
1,000,000
EUR
|
— |
1,000,000
EUR
|
— | — | — | — | — | — | — | — |
1,000,000
EUR
|
16,000,000
EUR
|
— | — | — | — | — | — | — | — |
3,000,000
EUR
|
13,000,000
EUR
|
13,000,000
EUR
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
1,000,000
EUR
|
— | — | — |
9,000,000
EUR
|
— |
9,000,000
EUR
|
— | — | — | — | — | — | — | — |
10,000,000
EUR
|
5,000,000
EUR
|
— | — | — | — | — | — | — | — |
1,000,000
EUR
|
4,000,000
EUR
|
4,000,000
EUR
|
— | — | — | — | — | — | — |