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Tax - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Tax Credit Carryforward [Line Items]          
Effective tax rate 26.90%   31.80% 32.90% 31.10%
Effective tax rate excluding discrete items 29.90%     29.40%  
U.S. federal statutory rate       35.00%  
Unrecognized tax benefit $ 125     $ 125  
Reserve of uncertain tax position identified in foreign jurisdiction   $ 69      
Uncertain tax position settled       60  
Uncertain tax position remaining amount 9     9  
Realized [Member]          
Tax Credit Carryforward [Line Items]          
Unrecognized tax benefit $ 52     $ 52