Leases - Supplemental Operating Lease Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Document Period End Date	Sep. 30, 2020
Operating lease right-of-use assets	$ 96	$ 105
Accrued liabilities	25	26
Operating lease liabilities	79	88
Operating lease liabilities	104	114
Operating Lease, Right-of-Use Asset, in Exchange for Lease Obligations	$ 23	$ 25
Operating Lease, Weighted Average Remaining Lease Term	5 years	5 years
Weighted average discount rate	5.00%	5.00%