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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]      
Reduction in deferred tax expense $ 61    
Increase in current income tax expense 38    
Undistributed earnings of certain foreign subsidiaries 5,070    
Income taxes paid, net 782 $ 707  
Income tax loss carryforwards 2,600    
Tax credit carryforwards 59    
Total losses 1,870    
Gross unrecognized tax benefits 243 220 $ 221
Recognized tax benefits 222 201  
Interest and penalties on the unrecognized tax benefits 45 35  
Recoveries/(expenses) related to changes in reserves for interest and penalties 10 $ 14  
Decrease in gross unrecognized tax benefits 88    
Decrease in recognized tax benefits $ 77    
Minimum [Member]      
Income Taxes [Line Items]      
Expiry date of losses 2018    
Maximum [Member]      
Income Taxes [Line Items]      
Expiry date of losses 2037