Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2008
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Cash and due from banks	$ 2,663	[1]	$ 2,159	[1]	$ 2,318	$ 2,739
Other short-term investments	1,781		1,515
Commercial mortgage loans	10,138	[1]	10,845	[1]
Home equity	10,719	[1]	11,513	[1]
Automobile loans	11,827	[1]	10,983	[1]
Allowance for loan and lease losses	(2,255)	[1]	(3,004)	[1]	(3,749)	(2,787)
Other assets	8,863	[1]	8,400	[1]
Total Assets	116,967		111,007		113,380
Other liabilities	3,270	[1]	2,979	[1]
Long-term debt	9,682	[1]	9,558	[1]
Total liabilities	103,716		96,927
Noncontrolling interest	50		29
Variable Interest Entity, Primary Beneficiary
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Cash and due from banks	30		52
Other short-term investments	7		7
Commercial mortgage loans	50		29
Home equity	223		241
Automobile loans	259		648
Allowance for loan and lease losses	(10)		(14)
Other assets	4		7
Total Assets	563		970
Other liabilities	4		12
Long-term debt	191		692
Total liabilities	195		704
Noncontrolling interest	50		29
Variable Interest Entity, Primary Beneficiary | Home Equity
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Cash and due from banks	5		7
Home equity	223		241
Allowance for loan and lease losses	(5)		(5)
Other assets	1		1
Total Assets	224		244
Long-term debt	22		133
Total liabilities	22		133
Variable Interest Entity, Primary Beneficiary | Automobile Loan
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Cash and due from banks	25		45
Other short-term investments	7		7
Automobile loans	259		648
Allowance for loan and lease losses	(3)		(8)
Other assets	1		5
Total Assets	289		697
Other liabilities	4		12
Long-term debt	169		559
Total liabilities	173		571
Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Commercial mortgage loans	50		29
Allowance for loan and lease losses	(2)		(1)
Other assets	2		1
Total Assets	50		29
Noncontrolling interest	$ 50		$ 29

[1] At December 31, 2011 and 2010, includes $30 and $52 of cash, $7 of other short-term investments, $50 and $29 of commercial mortgage loans, $223 and $241 of home equity loans, $259 and $648 of automobile loans, ($10) and ($14) of ALLL, $4 and $7 of other assets, $4 and $12 of other liabilities, $191 and $692 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 11.