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Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accounting Standards Update 2016-01 [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation attributable to non-controlling interests   $ 29
Foreign Currency Translation Adjustments Attributable to Non-controlling Interests [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation attributable to non-controlling interests $ 81