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Tax - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Tax Credit Carryforward [Line Items]          
Effective tax rate (9.60%) 18.80% 6.50% 30.40%  
Increase in valuation allowance     $ 213    
U.S. federal statutory rate     35.00%    
Unrecognized tax benefit $ 66   $ 66    
Non-current deferred tax assets reclassified to non-current deferred tax liabilities $ 135   $ 135   $ 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