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Borrowings - Long Term Debt, Interest Rates and Maturity Dates (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Instruments [Line Items]    
Total long-term debt $ 42,976 $ 41,963
Truist Financial Corporation: | Senior notes | Fixed rate    
Debt Instruments [Line Items]    
Total long-term debt 20,327 20,093
Truist Financial Corporation: | Subordinated notes | Fixed rate    
Debt Instruments [Line Items]    
Total long-term debt 1,589 1,818
Truist Financial Corporation: | Capital notes    
Debt Instruments [Line Items]    
Total long-term debt 641 639
Truist Bank: | Senior notes | Fixed rate    
Debt Instruments [Line Items]    
Total long-term debt 5,013 4,476
Truist Bank: | Senior notes | Floating rate    
Debt Instruments [Line Items]    
Total long-term debt 849 499
Truist Bank: | Subordinated notes | Fixed rate    
Debt Instruments [Line Items]    
Total long-term debt 2,779 3,553
Truist Bank: | FHLB advances | Floating rate    
Debt Instruments [Line Items]    
Total long-term debt 10,150 9,450
Truist Bank: | Other long-term debt    
Debt Instruments [Line Items]    
Total long-term debt $ 1,628 $ 1,435