Lease Liability Maturities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	$ 181
2021	159
2022	135
2023	85
2024	57
Thereafter	142
Total lease payments	759
Less: imputed interest	(112)
Operating lease liability	647
Finance Lease, Liability, Payment, Due [Abstract]
2020	20
2021	17
2022	15
2023	13
2024	12
Thereafter	53
Total lease payments	130
Less: imputed interest	(37)
Finance Lease, Liability	$ 93