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 |
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 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 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 |
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 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-01-01 |
As at 2019-01-01 |
As at 2019-01-01 |
As at 2019-01-01 |
As at 2019-01-01 |
As at 2019-01-01 |
As at 2019-01-01 |
As at 2019-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||
| Equity | — |
26,698,000,000
USD
|
1,004,000,000
USD
|
42,000,000
USD
|
29,850,000,000
USD
|
3,632,000,000
USD
|
— | — | — |
432,000,000
USD
|
— |
30,854,000,000
USD
|
— | — | — |
6,000,000
USD
|
28,098,000,000
USD
|
— | — |
739,000,000
USD
|
692,000,000
USD
|
— | — |
28,837,000,000
USD
|
4,000,000
USD
|
25,117,000,000
USD
|
— |
97,000,000
USD
|
— | — |
3,774,000,000
USD
|
— |
103,000,000
USD
|
3,774,000,000
USD
|
29,756,000,000
USD
|
202,000,000
USD
|
33,380,000,000
USD
|
771,000,000
USD
|
32,609,000,000
USD
|
616,000,000
USD
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
2,900,000,000
USD
|
— | — | — | — | — |
-
USD
|
2,850,000,000
USD
|
-
USD
|
— |
-
USD
|
— |
-
USD
|
50,000,000
USD
|
2,850,000,000
USD
|
— | — |
-
USD
|
84,000,000
USD
|
— | — |
84,000,000
USD
|
40,000,000
USD
|
— | — | — |
44,000,000
USD
|
— |
-
USD
|
-
USD
|
— |
-
USD
|
— | — | — | — | — | — | — | — |
| Other comprehensive income |
108,000,000
USD
|
— | — | — | — | — |
1,000,000
USD
|
205,000,000
USD
|
55,000,000
USD
|
— |
-
USD
|
— |
260,000,000
USD
|
3,000,000
USD
|
111,000,000
USD
|
— | — |
76,000,000
USD
|
194,000,000
USD
|
— | — |
84,000,000
USD
|
11,000,000
USD
|
— | — | — |
183,000,000
USD
|
— |
180,000,000
USD
|
6,000,000
USD
|
— |
-
USD
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
3,008,000,000
USD
|
— | — | — | — | — |
1,000,000
USD
|
2,645,000,000
USD
|
55,000,000
USD
|
— |
-
USD
|
— |
260,000,000
USD
|
47,000,000
USD
|
2,961,000,000
USD
|
— | — |
76,000,000
USD
|
110,000,000
USD
|
— | — |
-
USD
|
29,000,000
USD
|
— | — | — |
139,000,000
USD
|
— |
180,000,000
USD
|
6,000,000
USD
|
— |
-
USD
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
520,000,000
USD
|
— | — | — | — | — |
-
USD
|
430,000,000
USD
|
-
USD
|
— |
-
USD
|
— |
-
USD
|
90,000,000
USD
|
430,000,000
USD
|
— | — |
-
USD
|
469,000,000
USD
|
— | — |
469,000,000
USD
|
73,000,000
USD
|
— | — | — |
542,000,000
USD
|
— |
-
USD
|
-
USD
|
— |
-
USD
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity |
-
USD
|
— | — | — | — | — |
3,000,000
USD
|
3,000,000
USD
|
-
USD
|
— |
-
USD
|
— |
-
USD
|
-
USD
|
-
USD
|
— | — |
-
USD
|
-
USD
|
— | — |
18,000,000
USD
|
-
USD
|
— | — | — |
-
USD
|
— |
18,000,000
USD
|
-
USD
|
— |
-
USD
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
11,000,000
USD
|
— | — | — | — | — |
-
USD
|
11,000,000
USD
|
-
USD
|
— |
-
USD
|
— |
-
USD
|
-
USD
|
11,000,000
USD
|
— | — |
-
USD
|
10,000,000
USD
|
— | — |
10,000,000
USD
|
-
USD
|
— | — | — |
10,000,000
USD
|
— |
-
USD
|
-
USD
|
— |
-
USD
|
— | — | — | — | — | — | — | — |