Statement Of Changes In Equity [Abstract]
| Concept |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
As at 2020-04-01 |
As at 2020-04-01 |
As at 2020-04-01 |
As at 2020-04-01 |
As at 2020-04-01 |
As at 2020-04-01 |
As at 2020-04-01 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
2019-04-01 to 2020-03-31 |
2019-04-01 to 2020-03-31 |
2019-04-01 to 2020-03-31 |
2019-04-01 to 2020-03-31 |
As at 2020-03-31 |
2019-04-01 to 2020-03-31 |
As at 2020-03-31 |
As at 2019-04-01 |
As at 2019-04-01 |
As at 2019-04-01 |
As at 2019-04-01 |
As at 2019-04-01 |
As at 2019-04-01 |
As at 2019-04-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||
| Equity |
19,207,000,000
USD
|
17,978,000,000
USD
|
3,119,000,000
USD
|
96,000,000
USD
|
1,756,000,000
USD
|
38,000,000
USD
|
3,081,000,000
USD
|
— | — | — | — | — |
1,574,000,000
USD
|
96,000,000
USD
|
18,221,000,000
USD
|
6,000,000
USD
|
2,275,000,000
USD
|
18,826,000,000
USD
|
2,281,000,000
USD
|
6,000,000
USD
|
2,275,000,000
USD
|
18,826,000,000
USD
|
18,221,000,000
USD
|
2,281,000,000
USD
|
— | — | — | — |
1,574,000,000
USD
|
— |
96,000,000
USD
|
96,000,000
USD
|
18,718,000,000
USD
|
1,559,000,000
USD
|
2,480,000,000
USD
|
17,893,000,000
USD
|
14,000,000
USD
|
2,494,000,000
USD
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — |
802,000,000
USD
|
803,000,000
USD
|
1,000,000
USD
|
803,000,000
USD
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
USD
|
675,000,000
USD
|
677,000,000
USD
|
675,000,000
USD
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — |
66,000,000
USD
|
84,000,000
USD
|
12,000,000
USD
|
6,000,000
USD
|
78,000,000
USD
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
USD
|
297,000,000
USD
|
298,000,000
USD
|
15,000,000
USD
|
— |
312,000,000
USD
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — | — |
66,000,000
USD
|
886,000,000
USD
|
815,000,000
USD
|
5,000,000
USD
|
881,000,000
USD
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
USD
|
378,000,000
USD
|
379,000,000
USD
|
690,000,000
USD
|
— |
312,000,000
USD
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — | — | — |
428,000,000
USD
|
427,000,000
USD
|
1,000,000
USD
|
427,000,000
USD
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
USD
|
424,000,000
USD
|
426,000,000
USD
|
424,000,000
USD
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — | — | — |
106,000,000
USD
|
106,000,000
USD
|
— |
106,000,000
USD
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
83,000,000
USD
|
83,000,000
USD
|
83,000,000
USD
|
— | — | — | — | — | — | — | — | — | — |