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Accumulated Other Comprehensive Income/(Loss) (Parenthetical) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
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 $ 15 $ 64
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening balance reclassification 5  
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening balance reclassification $ (5)