Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
2018-01-01 to 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
2018-01-01 to 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-01-01 |
As at 2018-01-01 |
As at 2018-01-01 |
As at 2018-01-01 |
As at 2018-01-01 |
As at 2018-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity | — |
11,641,000,000
USD
|
11,000,000
USD
|
8,000,000
USD
|
221,000,000
USD
|
— |
7,140,000,000
USD
|
— |
4,741,000,000
USD
|
— |
17,000,000
USD
|
— | — |
9,000,000
USD
|
5,947,000,000
USD
|
11,840,000,000
USD
|
— |
6,140,000,000
USD
|
— |
221,000,000
USD
|
— |
15,000,000
USD
|
5,834,000,000
USD
|
— | — | — |
6,782,000,000
USD
|
10,000,000
USD
|
221,000,000
USD
|
12,370,000,000
USD
|
10,000,000
USD
|
5,631,000,000
USD
|
17,000,000
USD
|
221,000,000
USD
|
6,646,000,000
USD
|
12,029,000,000
USD
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1,237,000,000
USD
|
— | — | — | — |
1,236,000,000
USD
|
— | — | — |
1,000,000
USD
|
— |
1,339,000,000
USD
|
2,000,000
USD
|
— | — | — |
1,341,000,000
USD
|
— | — | — | — | — | — |
2,238,000,000
USD
|
2,243,000,000
USD
|
5,000,000
USD
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
234,000,000
USD
|
— | — | — | — |
1,236,000,000
USD
|
— |
1,000,000,000
USD
|
— |
2,000,000
USD
|
— |
1,339,000,000
USD
|
4,000,000
USD
|
— | — | — |
1,985,000,000
USD
|
— |
642,000,000
USD
|
— |
1,151,000,000
USD
|
— | — |
2,238,000,000
USD
|
1,089,000,000
USD
|
2,000,000
USD
|
— | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
1,439,000,000
USD
|
— | — | — | — |
1,435,000,000
USD
|
— | — | — |
4,000,000
USD
|
— |
1,869,000,000
USD
|
— | — | — | — |
1,869,000,000
USD
|
— | — | — | — | — | — |
1,896,000,000
USD
|
1,897,000,000
USD
|
1,000,000
USD
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
USD
|
— | — | — |
2,000,000
USD
|
— | — | — | — | — | — |
1,000,000
USD
|
4,000,000
USD
|
3,000,000
USD
|
— | — | — | — | — | — | — | — | — | — |