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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]        
Valuation allowances released $ 89,000,000 $ 89,000,000 $ 78,000,000 $ 3,000,000
Remaining valuation allowances 94,000,000 94,000,000    
Income taxes paid, net   347,000,000 304,000,000 (6,000,000)
Income tax loss carryforwards 2,080,000,000 2,080,000,000    
Losses on acquisition 35,000,000 35,000,000    
Total losses 1,110,000,000 1,110,000,000    
Expiry date of losses   Between 2013 and 2032    
Gross unrecognized tax benefits 279,000,000 279,000,000 252,000,000 257,000,000
Recognized tax benefits 240,000,000 240,000,000 222,000,000  
Interest and penalties, on the unrecognized tax benefits 49,000,000 49,000,000 42,000,000  
Reserves for interest and penalties 7,000,000 7,000,000    
Decrease in gross unrecognized tax benefits 155,000,000 155,000,000    
Decrease in recognized tax benefits $ 140,000,000 $ 140,000,000