Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Variable Interest Entity
Total Assets	$ 129,654	$ 130,443	$ 121,382
Total Liabilities	114,790	115,817
Variable Interest Entity, Not Primary Beneficiary | Fifth Third Community Development Corporation Investments
Variable Interest Entity
Total Assets	1,418	1,436
Total Liabilities	369	407
Maximum Exposure	1,418	1,436
Variable Interest Entity, Not Primary Beneficiary | Private Equity Funds
Variable Interest Entity
Total Assets	209	204
Maximum Exposure	304	294
Variable Interest Entity, Not Primary Beneficiary | Loans Receivable
Variable Interest Entity
Total Assets	1,843	1,830
Maximum Exposure	2,807	2,792
Variable Interest Entity, Not Primary Beneficiary | Automobile Loan Securitizations
Variable Interest Entity
Total Assets	3	4
Maximum Exposure	3	4
Variable Interest Entity, Not Primary Beneficiary | Restructured Loans
Variable Interest Entity
Total Assets		1
Maximum Exposure		$ 1