v3.26.1
Accumulated Other Comprehensive Income - Reclassification Out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Interest on securities $ 501 $ 451
Interest and fees on loans and leases 2,293 1,816
Income before income taxes 207 653
Applicable income tax expense (42) (138)
Net Income 165 515
Reclassification out of AOCI    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net Income (38) (67)
Reclassification out of AOCI | Available-for-sale debt securities transferred to held-to-maturity securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Interest on securities (27) (32)
Income before income taxes (27) (32)
Applicable income tax expense 5 7
Net Income (22) (25)
Reclassification out of AOCI | Cash flow hedge derivatives    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Interest and fees on loans and leases (21) (56)
Income before income taxes (21) (56)
Applicable income tax expense 5 14
Net Income $ (16) $ (42)