Intangible Assets, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense associated with finite lived intangible assets	$ 8	$ 6	$ 6
Minimum
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	0
2020	6
2021	6
2022	6
2023	6
Maximum
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	8
2020	8
2021	8
2022	8
2023	$ 8
Customer relationship intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	7 years
Customer relationship intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	19 years