Statement Of Comprehensive Income [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 |
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 comprehensive income [abstract] | ||||||||||
| Profit (loss) | — |
803,000,000
USD
|
802,000,000
USD
|
1,000,000
USD
|
803,000,000
USD
|
2,000,000
USD
|
675,000,000
USD
|
675,000,000
USD
|
677,000,000
USD
|
— |
| Other comprehensive income [abstract] | ||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — |
2,000,000
USD
|
— | — | — | — | — |
26,000,000
USD
|
— |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Financial assets measured at fair value through other comprehensive income [abstract] | ||||||||||
| Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax | — | — |
11,000,000
USD
|
— | — | — | — | — |
6,000,000
USD
|
— |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | — |
1,000,000
USD
|
— | — | — | — | — |
5,000,000
USD
|
— |
| Other comprehensive income |
66,000,000
USD
|
12,000,000
USD
|
84,000,000
USD
|
6,000,000
USD
|
78,000,000
USD
|
1,000,000
USD
|
297,000,000
USD
|
15,000,000
USD
|
298,000,000
USD
|
312,000,000
USD
|
| Comprehensive income |
66,000,000
USD
|
815,000,000
USD
|
886,000,000
USD
|
5,000,000
USD
|
881,000,000
USD
|
1,000,000
USD
|
378,000,000
USD
|
690,000,000
USD
|
379,000,000
USD
|
312,000,000
USD
|
| Comprehensive income attributable to [abstract] | ||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
881,000,000
USD
|
— | — | — | — | — |
378,000,000
USD
|
— |
| Comprehensive income, attributable to non-controlling interests | — | — |
5,000,000
USD
|
— | — | — | — | — |
1,000,000
USD
|
— |