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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]            
Valuation allowance released $ 89,000,000 $ 78,000,000 $ 21,000,000 $ 89,000,000 $ 78,000,000  
Income taxes paid, net     507,000,000 347,000,000 304,000,000  
Income tax loss carryforwards     2,000,000,000      
Losses on acquisition     34,000,000      
Total losses     1,070,000,000      
Expiry date of losses     Between 2014 and 2033      
Gross unrecognized tax benefits 279,000,000 252,000,000 238,000,000 279,000,000 252,000,000 257,000,000
Recognized tax benefits 240,000,000 222,000,000 219,000,000 240,000,000 222,000,000  
Interest and penalties on the unrecognized tax benefits 49,000,000 42,000,000 42,000,000 49,000,000 42,000,000  
Recoveries/(expenses) related to changes in reserves for interest and penalties (7,000,000) 3,000,000 7,000,000 (7,000,000) 3,000,000  
Decrease in gross unrecognized tax benefits     66,000,000      
Decrease in recognized tax benefits     $ 62,000,000