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Receivables, net - Rollforward of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning balance $ 16  
Additions charged to expenses 8 $ (2)
Charge-offs and other (1)  
Ending balance 29  
Cumulative Effect, Period of Adoption, Adjustment [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning balance $ 6  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member