v3.25.1
Derivative Financial Instruments - Terminated Cash Flow and Fair Value Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Derivative [Line Items]    
Max time period which Truist is hedging a portion of the var. in future cash flows for forecasted transactions excluding those transactions relating to the payment of var. int. on existing instruments 4 years 5 years
Debt Securities, Held-to-maturity, Derivative, Cumulative Gain (Loss) $ 364 $ 373
Cash flow hedges    
Derivative [Line Items]    
Net unrecognized after-tax gain (loss) on active hedges recorded in AOCI (305) (722)
Net unrecognized after-tax gain (loss) on terminated hedges recorded in AOCI (to be recognized in earnings through 2029) (127) (139)
Fair Value Hedges    
Derivative [Line Items]    
Unrecognized pre-tax net gain (loss) on terminated hedges(1) [1] $ (145) $ (180)
[1] Includes deferred gains that are recorded in AOCI as a result of the reclassification to HTM of previously hedged securities of $364 million at March 31, 2025 and $373 million at December 31, 2024.