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Tax - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Tax Credit Carryforward [Line Items]      
Effective tax rate 50.00% 37.60%  
U.S. federal statutory rate 35.00%    
Unrecognized tax benefit $ 24    
Non-current deferred tax assets reclassified to non-current deferred tax liabilities $ 144   $ 130
Accounting Standards Update 2015-17 [Member]      
Tax Credit Carryforward [Line Items]      
Current deferred tax assets reclassified to non-current deferred tax liabilities     376
Non-current deferred tax assets reclassified to non-current deferred tax liabilities     358
Current deferred tax liabilities reclassified to non-current deferred tax liabilities     $ 291