Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2020-04-01 to 2021-03-31 |
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 |
2019-04-01 to 2020-03-31 |
2019-04-01 to 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||
| Statement of changes in equity [line items] | ||||||||||||
| Increase (decrease) through acquisition of subsidiary, equity |
90,000,000
USD
|
163,000,000
USD
|
— |
253,000,000
USD
|
— |
253,000,000
USD
|
— | — | — | — | — | — |
| Decrease (increase) through tax on share-based payment transactions, equity | — | — |
2,000,000
USD
|
2,000,000
USD
|
— |
2,000,000
USD
|
— |
5,000,000
USD
|
— |
5,000,000
USD
|
5,000,000
USD
|
— |
| Increase (decrease) through transactions with owners, equity |
177,000,000
USD
|
182,000,000
USD
|
434,000,000
USD
|
48,000,000
USD
|
27,000,000
USD
|
75,000,000
USD
|
9,000,000
USD
|
583,000,000
USD
|
15,000,000
USD
|
582,000,000
USD
|
592,000,000
USD
|
16,000,000
USD
|