Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 107		$ 222		$ 177
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Included In Earnings	166		176		149
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements Maturities Paydowns Net	2		(317)	[1]	(136)
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitiesIncludedInOtherComprehensiveIncome					3
Sales	(5)
Settlements	(164)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Level 3 Transfers Net	24	[2]	26	[2]	29	[2]
Ending balance	130		107		222
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Change In Unrealized Gains Losses Relating To Assets	(7)	[3]	46	[3]	16	[3]
Trading Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	6		13
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Included In Earnings			3		(4)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements Maturities Paydowns Net			(10)		17
Sales	(5)
Ending balance	1		6		13
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Change In Unrealized Gains Losses Relating To Assets					(4)	[3]
Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	46		26		7
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Included In Earnings	4				(2)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements Maturities Paydowns Net			(6)		(8)
Settlements	(9)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Level 3 Transfers Net	24	[2]	26	[2]	29	[2]
Ending balance	65		46		26
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Change In Unrealized Gains Losses Relating To Assets	4	[3]			(2)	[3]
Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	2	[4]	(2)	[4]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Included In Earnings	205	[4]	187	[4]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements Maturities Paydowns Net			(183)	[4]
Settlements	(175)	[4]
Ending balance	32	[4]	2	[4]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Change In Unrealized Gains Losses Relating To Assets	32	[3],[4]	60	[4]
Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	53	[4]	11	[4]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Included In Earnings	(43)	[4]	(14)	[4]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases	2	[4]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements Maturities Paydowns Net			56	[4]
Settlements	20	[4]
Ending balance	32	[4]	53	[4]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Change In Unrealized Gains Losses Relating To Assets	(43)	[3],[4]	(14)	[4]
Retained Interest
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			174		146
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Included In Earnings					10
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements Maturities Paydowns Net			(174)	[1]	15
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitiesIncludedInOtherComprehensiveIncome					3
Ending balance					174
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Change In Unrealized Gains Losses Relating To Assets					6	[3]
Derivative
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance					24	[5]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Included In Earnings					145	[5]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements Maturities Paydowns Net					(160)	[5]
Ending balance					9	[5]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Change In Unrealized Gains Losses Relating To Assets					$ 16	[3],[5]

[1] Due to a change in U.S. GAAP adopted by the Bancorp on January 1, 2010, all residual interests in securitizations were eliminated concurrent with the consolidation of the related VIEs.

[2] Includes residential mortgage loans held for sale that were transferred to held for investment.

[3] Includes interest income and expense.

[4] Net interest rate derivatives include derivative assets and liabilities of $34 and $2, respectively, as of December 31, 2011 and $13 and $11, respectively, as of December 31, 2010. Net equity derivatives include derivative assets and liabilities of $113 and $81, respectively, as of December 31, 2011, and $81 and $28, respectively, as of December 31, 2010.

[5] Net derivatives include derivative assets and liabilities of $84 and $75, respectively, at December 31, 2009