Lease Liability Maturities (Details) $ in Millions	Dec. 31, 2020 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2021	$ 181
2022	152
2023	100
2024	73
2025	49
Thereafter	121
Total lease payments	676
Less: imputed interest	(106)
Operating lease liability	$ 570
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued Liabilities
Finance Lease, Liability, Payment, Due [Abstract]
2021	$ 18
2022	14
2023	12
2024	12
2025	13
Thereafter	43
Total lease payments	112
Less: imputed interest	(31)
Finance Lease, Liability	$ 81