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Income Taxes - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Income Tax [Line Items]    
Net deferred tax is combination of deferred tax liabilities and valuation allowance $ 1,000,000,000 $ 900,000,000
Tax Reserve 285,000,000  
Accrued interest expenses to recognize the estimated tax exposure 134,000,000  
Unrecognized tax benefit, affect the effective tax rate 329,000,000 276,000,000
Accruals for payment of interest and penalties associated with uncertain tax positions $ 150,000,000 $ 130,000,000