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VIE (Variable Interest Entities - Additional Information) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Variable Interest Entity                
Allowance for loan and lease losses $ 1,091 [1] $ 1,205 $ 1,091 [1] $ 1,205 $ 1,077 $ 1,196 [1] $ 1,226 $ 1,253
Commercial mortgage loans 6,695   6,695     6,604    
Fifth Third Community Development Corporation Investments                
Variable Interest Entity                
Maximum Exposure 1,229   1,229     1,376    
Bancorp's Investment in Affordable Housing Tax Credits 1,229   1,229     1,376    
Private Equity Funds                
Variable Interest Entity                
Maximum Exposure 73   73     150    
Bancorp's Investment in Affordable Housing Tax Credits 40   40     102    
Variable Interest Entity, Primary Beneficiary                
Variable Interest Entity                
Allowance for loan and lease losses 4   4     6    
Commercial mortgage loans 20   20     20    
Variable Interest Entity, Primary Beneficiary | Automobile Loans                
Variable Interest Entity                
Carry value of automobile loans securitized 1,100   1,100          
Face amount of notes issued or redeemed 1,000   1,000          
Long Term Debt Retained 261   261          
Allowance for loan and lease losses 4   4     6    
Commercial mortgage loans 0   0     0    
Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments                
Variable Interest Entity                
Maximum Exposure 19   19     17    
Allowance for loan and lease losses 0   0     0    
Commercial mortgage loans 20   20     20    
Variable Interest Entity, Not Primary Beneficiary | Loans Provided to VIEs                
Variable Interest Entity                
Unfunded commitment amounts 1,200   1,200     1,100    
Variable Interest Entity, Not Primary Beneficiary | Fifth Third Community Development Corporation Investments | Qualified Affordable Housing Tax Credits                
Variable Interest Entity                
Bancorp's Investment in Affordable Housing Tax Credits 1,100   1,100     1,300    
Unfunded commitments $ 368   368     355    
Unfunded commitments expected funding date 2034              
Variable Interest Entity, Not Primary Beneficiary | Private Equity Funds                
Variable Interest Entity                
Unfunded commitment amounts $ 33   33     $ 48    
Capital Contribution To Private Equity Investments 1 2 6 9        
OTTI $ 0   $ 8          
Deconsolidated Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments                
Variable Interest Entity                
Maximum Exposure   18   18        
Allowance for loan and lease losses   20   20        
Commercial mortgage loans   $ 27   $ 27        
[1]

Includes $ 41 and $ 62 of other short-term investments , $ 793 and $ 1,297 of portfolio loans and leases, $ (4) and $ (6) of ALLL, $ 5 and $ 7 of other assets, $ 1 and $ 2 of other liabilities, and $ 710 and $ 1,190 of long-term debt from consolidated VIEs that are included in their respe ctive captions above at September 30, 2018 and December 31, 2017 , respectively. For further information refer to Note 10 .