Leases - Other Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 8	$ 21
Leased assets obtained in exchange for new operating lease liabilities	$ (5)	$ 150
Weighted average remaining lease term - operating leases, in years	5 years 8 months 12 days	5 years 8 months 12 days
Weighted average discount rate - operating leases	5.00%	5.00%