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Leases - Undiscounted Cash Flows under ASC 842 (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 19	$ 24
2022	14	16
2023	9	12
2024	5	7
2025	3	4
Thereafter	1	2
Total minimum lease payments	51	65
Less: amount of lease payments representing interest	(8)	(7)
Present value of future minimum lease payments	43	58
Less: current obligations under leases	(15)	(20)
Long-term lease obligations	28	38
Finance Lease, Liability, Payment, Due [Abstract]
2021	80	60
2022	56	54
2023	17	23
2024	0	0
2025	0	0
Thereafter	0	0
Total minimum lease payments	153	137
Less: amount of lease payments representing interest	(8)	(7)
Present value of future minimum lease payments	145	130
Less: current obligations under leases	(75)	(55)
Long-term lease obligations	$ 70	$ 75

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