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Revenue from Contracts with Customers - Receivables, Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivables, net $ 125 $ 173
Current contract liabilities (deferred revenues) (18) (20)
Non-current contract liabilities (deferred revenues) $ (13) $ (9)