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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||
| Increase (decrease) through acquisition of subsidiary, equity |
14,000,000
USD
|
-
USD
|
288,000,000
USD
|
-
USD
|
302,000,000
USD
|
-
USD
|
14,000,000
USD
|
-
USD
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through transactions with owners, equity |
1,064,000,000
USD
|
142,000,000
USD
|
991,000,000
USD
|
-
USD
|
218,000,000
USD
|
-
USD
|
1,209,000,000
USD
|
3,000,000
USD
|
-
USD
|
-
USD
|
4,621,000,000
USD
|
18,000,000
USD
|
4,639,000,000
USD
|
4,682,000,000
USD
|
61,000,000
USD
|
-
USD
|
| Purchase of treasury shares |
806,000,000
USD
|
-
USD
|
806,000,000
USD
|
-
USD
|
-
USD
|
-
USD
|
806,000,000
USD
|
-
USD
|
-
USD
|
-
USD
|
791,000,000
USD
|
-
USD
|
791,000,000
USD
|
791,000,000
USD
|
-
USD
|
-
USD
|
| Sale or issue of treasury shares |
30,000,000
USD
|
-
USD
|
30,000,000
USD
|
-
USD
|
-
USD
|
-
USD
|
30,000,000
USD
|
-
USD
|
— | — | — | — | — | — | — | — |