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, 2013		Dec. 31, 2012		Mar. 31, 2012	Dec. 31, 2011
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Commercial mortgage loans	$ 8,766	[1]	$ 9,103	[1]
Allowance for loan and lease losses	(1,783)	[1]	(1,854)	[1]	(2,126)	(2,255)
Other assets	8,211	[1]	8,204	[1]
Total Assets	121,382		121,894		116,747
Noncontrolling interests	38		48
Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Commercial mortgage loans	50		50
Allowance for loan and lease losses	(13)		(5)
Other assets	1		3
Total Assets	38		48
Noncontrolling interests	$ 38		$ 48

[1] Includes $50 and $50 of commercial mortgage loans, $(13) and $(5) of ALLL, $1 and $3 of other assets from consolidated VIEs that are included in their respective captions above at March 31, 2013 and December 31, 2012, respectively. See Note 8.