Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2020-01-01 to 2020-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||
| Dividends recognised as distributions to owners of parent |
26,000,000
EUR
|
— |
782,000,000
EUR
|
— |
4,000,000
EUR
|
2,000,000
EUR
|
754,000,000
EUR
|
25,000,000
EUR
|
453,000,000
EUR
|
775,000,000
EUR
|
2,000,000
EUR
|
456,000,000
EUR
|
— |
2,000,000
EUR
|
319,000,000
EUR
|
— |
2,000,000
EUR
|
400,000,000
EUR
|
336,000,000
EUR
|
738,000,000
EUR
|
403,000,000
EUR
|
— |
3,000,000
EUR
|
| Increase (decrease) through transfer between revaluation surplus and retained earnings, equity |
-
EUR
|
— |
2,000,000
EUR
|
2,000,000
EUR
|
— | — | — |
-
EUR
|
— |
204,000,000
EUR
|
— | — |
204,000,000
EUR
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through exercise of options, equity |
31,000,000
EUR
|
55,000,000
EUR
|
24,000,000
EUR
|
— | — | — | — |
31,000,000
EUR
|
30,000,000
EUR
|
28,000,000
EUR
|
— |
30,000,000
EUR
|
— | — | — |
58,000,000
EUR
|
— |
51,000,000
EUR
|
— |
34,000,000
EUR
|
51,000,000
EUR
|
85,000,000
EUR
|
— |
| Decrease (increase) through tax on share-based payment transactions, equity |
4,000,000
EUR
|
— | — | — | — | — |
4,000,000
EUR
|
4,000,000
EUR
|
10,000,000
EUR
|
— | — |
10,000,000
EUR
|
— | — |
10,000,000
EUR
|
— | — |
11,000,000
EUR
|
11,000,000
EUR
|
— |
11,000,000
EUR
|
— | — |
| Purchase of treasury shares |
130,000,000
EUR
|
130,000,000
EUR
|
-
EUR
|
— | — | — | — |
130,000,000
EUR
|
621,000,000
EUR
|
— | — |
621,000,000
EUR
|
— | — | — |
621,000,000
EUR
|
— |
514,000,000
EUR
|
— | — |
514,000,000
EUR
|
514,000,000
EUR
|
— |
| Sale or issue of treasury shares |
23,000,000
EUR
|
161,000,000
EUR
|
7,000,000
EUR
|
— |
-
EUR
|
— |
146,000,000
EUR
|
23,000,000
EUR
|
31,000,000
EUR
|
11,000,000
EUR
|
— |
31,000,000
EUR
|
— | — |
246,000,000
EUR
|
266,000,000
EUR
|
— |
61,000,000
EUR
|
276,000,000
EUR
|
4,000,000
EUR
|
61,000,000
EUR
|
341,000,000
EUR
|
— |
| Cancellation of treasury shares | — |
152,000,000
EUR
|
151,000,000
EUR
|
— |
1,000,000
EUR
|
— | — | — | — |
1,308,000,000
EUR
|
— | — | — |
8,000,000
EUR
|
— |
1,316,000,000
EUR
|
5,000,000
EUR
|
— | — |
779,000,000
EUR
|
— |
783,000,000
EUR
|
— |