Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept |
2020-01-01 to 2020-12-31 |
2019-01-01 to 2019-12-31 |
2018-01-01 to 2018-12-31 |
|---|---|---|---|
| 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] | |||
| Other expense, by function |
67,000,000
USD
|
30,000,000
USD
|
11,000,000
USD
|
| Tax expense (income) |
343,000,000
USD
|
453,000,000
USD
|
486,000,000
USD
|