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Income Taxes - Difference Between Effective Tax Rate (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Federal income tax at U.S. statutory rate $ 1,171 $ 1,227 $ 1,023
Foreign income tax rate differential (221) (154) (152)
State income tax, net of federal benefit 30 31 22
Nondeductible expenses 28 30 42
Tax benefit of manufacturing deduction (33) (29) (37)
Foreign dividends, net of foreign tax credits 31 (115) 9
Change in deferred tax valuation allowance 40 80 (18)
Other (28) (48) 48
Total income tax provision $ 1,018 $ 1,022 $ 937