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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Income Before Income Tax Domestic And Foreign Line Items      
Income before income taxes, Domestic $ 1,812 $ 1,282 $ 727
Income before income taxes, Foreign 1,693 1,640 1,670
Income before income taxes $ 3,505 $ 2,922 $ 2,397