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Share-Based Awards - Summary of Option Award (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Number of Shares Subject to Existing Options (in thousands)    
Beginning Balance (in shares) | shares 25,746  
Granted (in shares) | shares 6,792  
Exercised (in shares) | shares (1,078)  
Forfeited or cancelled (in shares) | shares (3,061)  
Ending Balance (in shares) | shares 28,399 25,746
Vested and exercisable (in shares) | shares 15,398  
Weighted- Average Exercise Price Per Share    
Beginning Balance (usd per share) | $ / shares $ 72.86  
Granted (usd per share) | $ / shares 46.47  
Exercised (usd per share) | $ / shares 40.59  
Forfeited or cancelled (usd per share) | $ / shares 88.70  
Ending Balance (usd per share) | $ / shares 45.25 $ 72.86
Vested and exercisable (usd per share) | $ / shares $ 44.74  
Weighted- Average Remaining Contractual Life (Years)    
Weighted-Average Remaining Contractual Life, Outstanding 7 years 3 months 21 days 7 years 5 months 23 days
Weighted-Average Remaining Contractual Life, Vested and exercisable 6 years 1 month 6 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding | $ $ 8 $ 354
Aggregate Intrinsic Value, Vested and exercisable | $ $ 8