Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012		Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Commercial mortgage loans	$ 8,443	[1]		$ 9,103	[1]
Allowance for loan and lease losses	(1,735)	[1]	(1,783)	(1,854)	[1]	(2,016)	(2,126)	(2,255)
Other assets	9,213	[1]		8,204	[1]
Total Assets	123,360			121,894		117,543
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, and $1 and $3 of other assets from consolidated VIEs that are included in their respective captions above at June 30, 2013 and December 31, 2012, respectively. See Note 8.