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Related Party Transactions - Coforge Business Process Solutions Private Limited and CDC Investments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transactions          
Total other noninterest income     $ 207 $ 265 $ 332
Other noninterest expense     1,237 968 951
Loans outstanding, VIEs     $ 114,912 119,286  
Fifth Third Mauritius Holdings Limited          
Related Party Transactions          
Ownership percentage by parent     100.00%    
Equity Method Investee          
Related Party Transactions          
Loans outstanding, VIEs     $ 6 10  
Related party, deposit liabilities     $ 83 73  
Equity Method Investee | Fifth Third Mauritius Holdings Limited | Coforge Business Process Solutions Private Limited          
Related Party Transactions          
Ownership percentage     20.00%    
Equity Method Investee | Unfunded Commitment          
Related Party Transactions          
Unfunded commitments in qualifying LIHTC investments     $ 12 16  
Equity Method Investee | Coforge Business Process Solutions Private Limited          
Related Party Transactions          
Percentage of interests sold 20.00% 9.00%      
Gain from sale of stock in equity method investment $ 34 $ 12      
Dividend on equity method investment     4 9 5
Other noninterest expense     41 26 21
Investment     8 17  
Equity Method Investee | Coforge Business Process Solutions Private Limited | Other noninterest income          
Related Party Transactions          
Total other noninterest income     $ 3 $ 7 $ 3