VIE (Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses) (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Private Equity Investments
Variable Interest Entity
Total Assets	$ 86	$ 41
Total Liabilities	0	0
Maximum Exposure	165	73
Loans Provided to VIEs
Variable Interest Entity
Total Assets	2,335	2,331
Total Liabilities	0	0
Maximum Exposure	3,672	3,617
Lease pool entities
Variable Interest Entity
Total Assets	67
Total Liabilities	0
Maximum Exposure	67
Fifth Third Community Development Corporation Investments
Variable Interest Entity
Total Assets	1,202	1,198
Total Liabilities	386	376
Maximum Exposure	$ 1,202	$ 1,198