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Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Income before income taxes, Domestic $ 1,523 $ 1,812 $ 1,282
Income before income taxes, Foreign 1,823 1,693 1,640
Income before income taxes $ 3,346 $ 3,505 $ 2,922