Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Detail) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Variable Interest Entity [Line Items]
Total Assets	$ 110,805	$ 111,007	$ 112,025
Total Liabilities	98,204	96,927	98,324
Variable Interest Entity, Not Primary Beneficiary | Money Market Funds
Variable Interest Entity [Line Items]
Total Assets	59	148
Maximum Exposure	66	158
Variable Interest Entity, Not Primary Beneficiary | Loans Receivable
Variable Interest Entity [Line Items]
Total Assets	1,236	1,175	1,228
Maximum Exposure	2,010	1,908	1,855
Variable Interest Entity, Not Primary Beneficiary | Private Equity Funds
Variable Interest Entity [Line Items]
Total Assets	114	129	114
Total Liabilities	2	3	2
Maximum Exposure	298	322	273
Variable Interest Entity, Not Primary Beneficiary | Restructured Loans
Variable Interest Entity [Line Items]
Total Assets	12	12	23
Maximum Exposure	14	13	24
Fifth Third Community Development Corporation Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	1,282	1,241	1,127
Total Liabilities	282	286	255
Maximum Exposure	$ 1,282	$ 1,241	$ 1,127