Leases - Supplemental Operating Lease Information (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 92	$ 94
Accrued liabilities	27	26
Operating lease liabilities	73	77
Operating lease liabilities	100	103
Operating Lease, Right-of-Use Asset, in Exchange for Lease Obligations	$ 16	$ 15
Operating Lease, Weighted Average Remaining Lease Term	5 years	5 years
Weighted average discount rate	5.00%	5.00%