Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011		Dec. 31, 2010
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Cash and due from banks	$ 2,235	[1]	$ 2,663	[1]	$ 2,121	[1]	$ 2,159
Other short-term investments	1,628	[1]	1,781	[1]	2,481	[1]
Commercial mortgage loans	9,909	[1]	10,138	[1]	10,510	[1]
Home equity	10,493	[1]	10,719	[1]	11,222	[1]
Automobile loans	11,832	[1]	11,827	[1]	11,129	[1]
Allowance for loan and lease losses	(2,126)	[1]	(2,255)	[1]	(2,805)	[1]	(3,004)
Other assets	8,504	[1]	8,863	[1]	7,967	[1]
Total Assets	116,747		116,967		110,485
Other liabilities	3,066	[1]	3,270	[1]	2,948	[1]
Long-term debt	9,648	[1]	9,682	[1]	10,555	[1]
Total liabilities	103,137		103,716		98,293
Noncontrolling interest	50		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	19		30		54
Other short-term investments	4		7		7
Commercial mortgage loans	50		50		29
Home equity	217		223		236
Automobile loans	105		259		529
Allowance for loan and lease losses	(7)		(10)		(12)
Other assets	3		4		5
Total Assets	391		563		848
Other liabilities	3		4		10
Long-term debt	125		191		492
Total liabilities	128		195		502
Noncontrolling interest	50		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	6		5		7
Home equity	217		223		236
Allowance for loan and lease losses	(4)		(5)		(5)
Other assets	1		1		1
Total Assets	220		224		239
Long-term debt	19		22		50
Total liabilities	19		22		50
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	13		25		47
Other short-term investments	4		7		7
Automobile loans	105		259		529
Allowance for loan and lease losses	(1)		(3)		(6)
Other assets			1		3
Total Assets	121		289		580
Other liabilities	3		4		10
Long-term debt	106		169		442
Total liabilities	109		173		452
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		50		29
Allowance for loan and lease losses	(2)		(2)		(1)
Other assets	2		2		1
Total Assets	50		50		29
Noncontrolling interest	$ 50		$ 50		$ 29

[1] Includes $19, $30 and $54 of cash, $4, $7 and $7of other short-term investments, $50, $50 and $29 of commercial mortgage loans, $217, $223 and $236 of home equity loans, $105, $259 and $529 of automobile loans, ($7), ($10) and ($12) of ALLL, $3, $4 and $5 of other assets, $3, $4 and $10 of other liabilities, $125, $191and $492 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2012, December 31, 2011 and March 31, 2011, respectively. See Note 8.