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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Contingency [Line Items]        
Settlements with various foreign and state tax authorities $ 299,000,000 $ 140,000,000 $ 253,000,000  
Effective tax rate 2.50% 9.50% 6.20%  
Accumulated earnings of foreign subsidiaries 12,400,000,000      
Unrecognized tax benefits 1,189,000,000 1,164,000,000 1,522,000,000 1,256,000,000
Impact on tax provision from unrecognized tax benefits 1,110,000,000 1,096,000,000    
Unrecognized tax benefits reasonably possible increase resulting from unfavorable audit developments 50,000,000      
Unrecognized tax benefits reasonably possible reductions due to audit settlements and expiration of statutes of limitations 350,000,000      
Unrecognized tax benefits, income tax penalties and interest accrued 228,000,000 230,000,000    
Net benefit for interest and penalties 6,000,000      
Interest and penalties paid $ 1,000,000