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 |