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Income Taxes - Additional Information (Detail) (USD $) In Millions	3 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Income Taxes [Line Items]
Accrued interest liabilities, net of the related tax benefits	$ 2	$ 1	$ 2
Recorded income tax expense from stock-based awards	23
One Year from Balance Sheet Date
Income Taxes [Line Items]
Estimated tax expense from stock-based awards	24
Fiscal Year 2011
Income Taxes [Line Items]
Estimated tax expense from stock-based awards	$ 24
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Audit of the Bancorp's federal income tax returns	2008 and 2009 tax years

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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