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Retirement and Benefit Plans (Retirement and Benefit Plans - Additional Information) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure      
The estimated net actuarial loss for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost $ (7)    
The increase in pension expense by lowering both the expected rate of return on the plan and the discount rate by 0.25% 1    
Defined Benefit Plan Expected Future Benefit Payments in 2017 18    
Defined Benefit Plan Expected Future Benefit Payments in 2018 17    
Defined Benefit Plan Expected Future Benefit Payments in 2019 16    
Defined Benefit Plan Expected Future Benefit Payments in 2020 16    
Defined Benefit Plan Expected Future Benefit Payments in 2021 16    
Defined Benefit Plan Expected Future Benefit Payments in 2022 through 2026 77    
Estimated future defined benefit plan contributions 3    
Plan assets managed [1] 172 $ 166  
Net underfunded status (34) (54)  
Fifth Third Bank      
Defined Benefit Plan Disclosure      
Plan assets managed through collective funds 172 166  
Non-qualified defined contribution plan      
Defined Benefit Plan Disclosure      
Expenses recognized for the Bancorp's defined contribution plan 3 3 $ 2
Qualified defined contribution plan      
Defined Benefit Plan Disclosure      
Expenses recognized for the Bancorp's defined contribution plan 75 71 44
Deferred profit sharing      
Defined Benefit Plan Disclosure      
Expenses recognized for the Bancorp's defined contribution plan 0 0 $ 19
Common stock      
Defined Benefit Plan Disclosure      
Plan assets managed $ 5 $ 4  
[1]

For further information on fair value hierarchy levels, refer to Note 1.