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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tax Credit Carryforward [Line Items]        
Federal statutory income tax rate 21.00% 35.00%    
Income tax benefit related to revaluation of net deferred tax liability   $ 242    
Effective income tax rate 153.70% 39.80%    
Unrecognized tax benefit $ 98 $ 132 $ 78 $ 46
Decrease in unrecognized tax benefits from settlements of foreign jurisdiction audit 69   3  
Increase in unrecognized tax position from completion of audits of foreign jurisdictions from prior years 31 64 65  
Decrease in unrecognized tax benefits is reasonably possible 7      
Income tax interest and penalties related to unrecognized tax benefit 0 17 $ 10  
Accrued income tax interest and penalties related to unrecognized tax benefit 12 $ 32    
Foreign tax credit 766      
Net operating loss carry forward 893      
Tax-deductible goodwill 133      
Undistributed earnings of foreign subsidiaries $ 3,254      
Maximum [Member]        
Tax Credit Carryforward [Line Items]        
Period of amortization of goodwill 12 years      
Carry Forward Expiration Year 2020 [Member]        
Tax Credit Carryforward [Line Items]        
Net operating loss carry forward $ 10      
Carry Forward Expiration Year 2022 [Member]        
Tax Credit Carryforward [Line Items]        
Net operating loss carry forward 141      
Carry Forward Expiration Year 2026 [Member]        
Tax Credit Carryforward [Line Items]        
Net operating loss carry forward 286      
Carry Forward Expiration Year 2027 [Member]        
Tax Credit Carryforward [Line Items]        
Net operating loss carry forward 142      
Carry Forward Expiration Year 2028 [Member]        
Tax Credit Carryforward [Line Items]        
Net operating loss carry forward $ 187