Lease Obligations -Schedule of Lease Expense (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2021 |
Jun. 30, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Leases [Abstract] | ||||
| Operating lease cost | $ 14 | $ 16 | $ 40 | $ 27 |
| Finance lease cost: | ||||
| Amortization of leased assets | 12 | 13 | 21 | 15 |
| Interest of lease liabilities | 2 | 2 | 4 | 4 |
| Variable and short-term lease cost | 3 | 3 | 6 | 8 |
| Sublease income | (3) | (4) | (6) | (8) |
| Total lease cost | $ 28 | $ 30 | $ 65 | $ 46 |