Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept |
2020-04-01 to 2021-03-31 |
2019-04-01 to 2020-03-31 |
|---|---|---|
| Statement of changes in net assets available for benefits [abstract] | ||
| Reconciliation of changes in net assets available for benefits [abstract] | ||
| Changes in net assets available for benefits [abstract] | ||
| Tax expense (income) |
275,000,000
USD
|
263,000,000
USD
|