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Revenue from Contracts with Customers - Significant Changes in Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change In Contract With Customer, Asset And Liability [Roll Forward]    
Contract assets, beginning balance $ 0 $ 1
Contract liabilities, beginning balance (29) (21)
Contract assets (liabilities), net, beginning balance (29) (20)
Amortization of revenue that was included in the beginning contract liability balance 23 14
Cash received, excluding amounts recognized as revenue (25) (22)
Cash received against the beginning contract asset balance   (1)
Contract assets, ending balance 0 0
Contract liabilities, ending balance (31) (29)
Contract assets (liabilities), net, ending balance $ (31) $ (29)