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 |
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 |
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 |
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 |
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 | — |
0
USD
|
1 891
USD
|
— | — |
2 230
USD
|
2 009
USD
|
221,000,000
USD
|
— |
118,000,000
USD
|
— | — | — |
1 890
USD
|
257,000,000
USD
|
— |
122,000,000
USD
|
2 008
USD
|
— |
4,000,000
USD
|
— |
2 265
USD
|
— | — |
1 880
USD
|
202,000,000
USD
|
2 082
USD
|
1 761
USD
|
4,000,000
USD
|
122,000,000
USD
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) |
20,000,000
USD
|
— | — | — |
72,000,000
USD
|
— | — | — | — | — |
53,000,000
USD
|
72,000,000
USD
|
178,000,000
USD
|
— | — | — | — | — |
117,000,000
USD
|
— | — | — |
61,000,000
USD
|
117,000,000
USD
|
— | — | — | — | — | — |
| Other comprehensive income |
3,000,000
USD
|
— | — | — |
32,000,000
USD
|
— | — | — | — | — |
35,000,000
USD
|
32,000,000
USD
|
23,000,000
USD
|
— | — | — | — | — |
24,000,000
USD
|
— | — | — |
1,000,000
USD
|
24,000,000
USD
|
— | — | — | — | — | — |
| Comprehensive income |
23,000,000
USD
|
— | — |
0
USD
|
41,000,000
USD
|
— | — | — |
0
USD
|
— |
17,000,000
USD
|
41,000,000
USD
|
200,000,000
USD
|
— | — |
0
USD
|
— | — |
141,000,000
USD
|
— |
0
USD
|
— |
59,000,000
USD
|
141,000,000
USD
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
8,000,000
USD
|
— | — | — |
42,000,000
USD
|
— | — | — | — | — |
50,000,000
USD
|
42,000,000
USD
|
13,000,000
USD
|
— | — | — | — | — |
9,000,000
USD
|
— | — | — |
3,000,000
USD
|
9,000,000
USD
|
— | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — | — | — |
8,000,000
USD
|
— | — | — | — | — |
8,000,000
USD
|
8,000,000
USD
|
3,000,000
USD
|
— | — | — | — | — |
3,000,000
USD
|
— | — | — | — |
3,000,000
USD
|
— | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
4,000,000
USD
|
— | — | — |
10,000,000
USD
|
— | — | — | — | — |
6,000,000
USD
|
10,000,000
USD
|
1,000,000
USD
|
— | — | — | — | — | — | — | — | — |
1,000,000
USD
|
— | — | — | — | — | — | — |