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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 12 Months Ended
Sep. 30, 2019
USD ($)
Arrangement
Dec. 31, 2020
USD ($)
Arrangement
Dec. 31, 2019
USD ($)
Arrangement
Dec. 31, 2018
USD ($)
Arrangement
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]        
Balances at beginning of year / period $ 13 $ 7 $ 13 $ 4
Acquisitions     8  
Issuances       11
Settlements (3) (4)   (2)
Adjustments to fair value (1) 4 (1)  
Balances at end of year / period $ 9 $ 7 $ 7 $ 13
Number of open contingent consideration arrangements at the end of period | Arrangement 9 3 5 10
Maximum potential payout at end of period $ 13 $ 7 $ 11 $ 20