Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 2,887	[1]		$ 2,441	[1]	$ 2,490		$ 2,663
Commercial mortgage loans	8,052	[1]		9,103	[1]
Automobile loans	12,072	[1]		11,972	[1]
Allowance for loan and lease losses	(1,677)	[1]	(1,735)	(1,854)	[1]	(1,925)	(2,016)	(2,255)
Other assets	8,098	[1]		8,204	[1]
Total Assets	125,673			121,894		117,483
Liabilities
Other liabilities	3,365	[1]		2,639	[1]
Long-term debt	8,098	[1]		7,085	[1]
Total Liabilities	110,993			108,130
Noncontrolling interests	39			48
Variable Interest Entity, Primary Beneficiary
Assets
Cash and due from banks	53
Commercial mortgage loans	50			50
Automobile loans	1,145	[2]
Allowance for loan and lease losses	(16)			(5)
Other assets	12			3
Total Assets	1,244			48
Liabilities
Other liabilities	2
Long-term debt	1,198
Total Liabilities	1,200
Noncontrolling interests	39			48
Variable Interest Entity, Primary Beneficiary | Automobile Loan
Assets
Cash and due from banks	53
Automobile loans	1,145	[2]
Allowance for loan and lease losses	(3)
Other assets	10
Total Assets	1,205
Liabilities
Other liabilities	2
Long-term debt	1,198
Total Liabilities	1,200
Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments
Assets
Commercial mortgage loans	50			50
Allowance for loan and lease losses	(13)			(5)
Other assets	2			3
Total Assets	39			48
Liabilities
Noncontrolling interests	$ 39			$ 48

[1] Includes $53 and $0 of cash and due from banks, $50 and $50 of commercial mortgage loans, $1,145 and $0 of automobile loans, $(16) and $(5) of ALLL, $12 and $3 of other assets, $2 and $0 of other liabilities, and $1,198 and $0 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2013 and December 31, 2012, respectively. See Note 9.

[2] Net of $56 of unamortized fees and discounts.