Variable Interest Entities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified					3 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013 Variable Interest Entity, Primary Beneficiary Fifth Third Community Development Corporation Investments	Dec. 31, 2012 Variable Interest Entity, Primary Beneficiary Fifth Third Community Development Corporation Investments	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary Loans Receivable	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary Loans Receivable	Mar. 31, 2013 Variable Interest Entity, Not Primary Beneficiary Automobile Loan	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary Fifth Third Community Development Corporation Investments	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary Fifth Third Community Development Corporation Investments	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary Private Equity Funds	Jun. 30, 2012 Variable Interest Entity, Not Primary Beneficiary Private Equity Funds	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary Private Equity Funds	Jun. 30, 2012 Variable Interest Entity, Not Primary Beneficiary Private Equity Funds	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary Private Equity Funds	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary Restructured Loans	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary Restructured Loans
Variable Interest Entity
Carry Value Of Loans Leases Or Lines Of Credit Securitized					$ 509
Number of seperate transactions in which the Bancorp previously sold loans to an isolated trust and conduits					1
Maximum Exposure	19	18				1,412	1,442	302		302		310	1	2
Unfunded commitment amounts			1,700	843				107		107		121
Capital Contribution To Private Equity Funds								$ 11	$ 13	$ 14	$ 24