Leases - Lease Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Operating Lease Obligations
2022	$ 45
2023	8
2024	5
2025	4
2026	2
Thereafter	0
Total undiscounted lease payments	64
Less: amount representing interest	1
Total lease liabilities	63
Less: current portion of lease liability as of December 31, 2021	40		$ 70
Long-term lease liability as of December 31, 2021	23		67
Finance Lease Obligations
2022	7
2023	7
2024	7
2025	7
2026	4
Thereafter	0
Total undiscounted lease payments	32
Less: amount representing interest	2
Total lease liabilities	30	$ 32
Less: current portion of lease liability as of December 31, 2021	6		0
Long-term lease liability as of December 31, 2021	24		0
Total Lease Obligations
2022	52
2023	15
2024	12
2025	11
2026	6
Thereafter	0
Total undiscounted lease payments	96
Less: amount representing interest	3
Total lease liabilities	93		$ 137
Less: current portion of lease liability as of December 31, 2021	46
Long-term lease liability as of December 31, 2021	$ 47