Leases - Future Maturities (Details) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
October 1, 2019 through December 31, 2019	$ 12
2020	55
2021	40
2022	30
2023	22
2024 and future years	37
Total future minimum lease payments	196
Less: Imputed interest	(13)
Operating lease liability	183
Less: Current portion of operating lease liability	(50)
Long-term portion of operating lease liability	$ 133