Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Detail) (Variable Interest Entity, Not Primary Beneficiary, USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fifth Third Community Development Corporation Investments
Variable Interest Entity [Line Items]
Total Assets	$ 1,424	$ 1,436
Total liabilities	348	407
Maximum Exposure	1,424	1,436
Private Equity Funds
Variable Interest Entity [Line Items]
Total Assets	208	204
Maximum Exposure	293	294
Loans Receivable
Variable Interest Entity [Line Items]
Total Assets	1,785	1,830
Maximum Exposure	2,925	2,792
Automobile Loan Securitizations
Variable Interest Entity [Line Items]
Total Assets	2	4
Maximum Exposure	2	4
Restructured Loans
Variable Interest Entity [Line Items]
Total Assets		1
Maximum Exposure		$ 1