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Receivables, net - Rollforward of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance For Doubtful Accounts Receivable Rollforward      
Beginning balance $ 16 $ 27 $ 29
Additions (deductions) charged to expenses 9 (2) 2
Charge-offs and other (3) (9) (4)
Ending balance 28 $ 16 $ 27
Cumulative Effect, Period of Adoption, Adjustment [Member]      
Allowance For Doubtful Accounts Receivable Rollforward      
Beginning balance $ 6    
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member
Ending balance   $ 6