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Fair Value of Financial Instruments - Summary of Reconciliation of Fair Value of Contingent Consideration Obligations (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Arrangement
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]  
Balances at beginning of period $ 7
Settlements (3)
Adjustments to fair value 2
Balance at end of period $ 6
Number of open contingent consideration arrangements at the end of period | Arrangement 3
Maximum potential payout at end of period $ 7