Lease Obligations - Summary of Supplemental Cash Flow and Other Information Related to Leases (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 cash flows from operating leases | $ 27 | $ 22 | $ 42 | $ 36 |
| Operating cash flows from finance leases | 2 | 2 | 4 | 4 |
| Financing cash flows from finance leases | 14 | 17 | 24 | 13 |
| Right-of use assets obtained in exchange for lease obligations Operating leases | 2 | 10 | 26 | 58 |
| Right-of use assets obtained in exchange for lease obligations Finance leases | $ 2 | $ 2 | $ 62 | $ 24 |