VIE - Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Private Equity Investments
Variable Interest Entity [Line Items]
Total Assets	$ 84	$ 41
Total Liabilities	0	0
Maximum Exposure	161	73
Loans Provided to VIEs
Variable Interest Entity [Line Items]
Total Assets	2,628	2,331
Total Liabilities	0	0
Maximum Exposure	3,979	3,617
Lease pool entities
Variable Interest Entity [Line Items]
Total Assets	66
Total Liabilities	0
Maximum Exposure	66
Fifth Third Community Development Corporation Investments
Variable Interest Entity [Line Items]
Total Assets	1,424	1,198
Total Liabilities	440	376
Maximum Exposure	$ 1,424	$ 1,198