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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2014
Scenario, Forecast
Income Tax Contingency [Line Items]        
Effective tax rate (22.00%) 2.30% 20.00% 20.10%
Total favorable discrete items $ 52 $ 94    
Net favorable tax audit settlements and expirations of statutes of limitations $ 51 $ 78