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Share-Based Compensation - Summary of Outstanding and SARs (Detail) - SARs
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Summary of SARs outstanding  
Outstanding, Aggregate intrinsic value (in millions) $ 225
Outstanding, Weighted-average remaining contractual life 3 years 7 months 6 days
Exercisable, Aggregate intrinsic value (in millions) $ 191
Exercisable, Weighted-average remaining contractual life 3 years 3 months 18 days