Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|
| 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] | ||
| Investment income |
-
USD
|
100,000
USD
|
| Administrative expenses |
13,200,000
USD
|
14,700,000
USD
|
| Tax expense (income) |
43,300,000
USD
|
25,600,000
USD
|