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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2014
Scenario, Forecast
Income Tax Contingency [Line Items]            
Benefit on provision for income tax, out-of-period adjustments $ 5          
Estimated effective tax rate         19.70% 19.60%
Effective tax rate 12.40% 4.40% 7.50% 3.50%    
Total favorable discrete items 52 93 104 186    
Net favorable tax audit settlements and expirations of statutes of limitations 9 52 60 132    
Tax return to provision adjustments 37   37      
Tax benefits from business divestiture   $ 39   $ 39