Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 105		$ 49		$ 107		$ 222
Total gains or losses (realized/unrealized):
Included in earnings	58		83		69		110
Purchases
Purchases, sales, issuances, and settlements, net			(39)				(247)
Sales					(5)
Settlements	(18)				(36)
Transfers into Level 3	5	[1]	7	[1]	15	[1]	15	[1]
Ending balance	150		100		150		100
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	31	[2]	32	[2]	18	[2]	25	[2]
Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	1		7		6		13
Total gains or losses (realized/unrealized):
Included in earnings							3
Purchases
Purchases, sales, issuances, and settlements, net			(2)				(11)
Sales					(5)
Ending balance	1		5		1		5
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end							(1)	[2]
Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	54		36		46		26
Total gains or losses (realized/unrealized):
Included in earnings	1				1
Purchases
Purchases, sales, issuances, and settlements, net			(2)
Settlements	(1)				(3)
Transfers into Level 3	5	[1]	7	[1]	15	[1]	15	[1]
Ending balance	59		41		59		41
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	1	[2]			1	[2]	1	[2]
Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	10	[3]	7	[3]	2	[3]	(2)	[3]
Total gains or losses (realized/unrealized):
Included in earnings	31	[3]	72	[3]	55	[3]	108	[3]
Purchases		[3]				[3]
Purchases, sales, issuances, and settlements, net			(55)	[3]			(82)	[3]
Settlements	(36)	[3]			(52)	[3]
Ending balance	5	[3]	24	[3]	5	[3]	24	[3]
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	4	[2],[3]	21	[2],[3]	4	[2],[3]	26	[2],[3]
Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	40	[3]	(1)	[3]	53	[3]	11	[3]
Total gains or losses (realized/unrealized):
Included in earnings	26	[3]	11	[3]	13	[3]	(1)	[3]
Purchases		[3]				[3]
Purchases, sales, issuances, and settlements, net			20	[3]			20	[3]
Settlements	19	[3]			19	[3]
Ending balance	85	[3]	30	[3]	85	[3]	30	[3]
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	26	[2],[3]	11	[2],[3]	13	[2],[3]	(1)	[2],[3]
Retained Interest
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance							174
Total gains or losses (realized/unrealized):
Purchases, sales, issuances, and settlements, net							$ (174)	[4]

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

[2] Includes interest income and expense.

[3] Net interest rate derivatives include derivative assets and liabilities of $9 and $4, respectively, as of June 30, 2011 and $25 and $1, respectively, as of June 30, 2010. Net equity derivatives include derivative assets and liabilities of $106 and $21, respectively, as of June 30, 2011, and $84 and $54, respectively, as of June 30, 2010.

[4] 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.