Leases - Supplemental Operating Lease Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 98		$ 105
Accrued liabilities	25		26
Operating lease liabilities	81		88
Operating lease liabilities	106		$ 114
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases for the three month period ended March 31, 2020 and 2019, respectively	$ 8	$ 8
Operating Lease, Weighted Average Remaining Lease Term	5 years		5 years
Weighted average discount rate	5.00%		5.00%