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Tax - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Tax Credit Carryforward [Line Items]          
Effective tax rate 35.80% 26.90% 41.60% 32.90%  
U.S. federal statutory rate     35.00%    
Unrecognized tax benefit $ 27   $ 27    
Non-current deferred tax assets reclassified to non-current deferred tax liabilities $ 147   $ 147   $ 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