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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Income Taxes [Line Items]  
Total of unrecognized tax benefits $ 164
Tax benefits affecting effective tax rate 46
Reversal of unrecognized tax benefits within the next twelve months 60
Time period for unrecognized tax benefits reversal Next twelve months
Payment of interest accrued 80
Accrued penalties related to unrecognized tax benefits $ 1