Leases - Maturity Schedules (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating leases
2019 (excluding the nine months ended September 30, 2019)	$ 33
2020	104
2021	80
2022	56
2023	39
Thereafter	60
Total future undiscounted lease payments	372
Less imputed interest	(34)
Total reported lease liability	338
Finance leases
2019 (excluding the nine months ended September 30, 2019)	1
2020	1
2021	0
2022	0
2023	0
Thereafter	0
Total future undiscounted lease payments	2
Less imputed interest	0
Total reported lease liability	$ 2