v3.26.1
INVESTMENT SECURITIES - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Investment Securities Held To Maturity [Line Items]    
Amortized Cost $ 4,183 $ 4,117
Gross Unrealized Gains 14 21
Gross Unrealized Losses (225) (197)
Fair  Value 3,972 3,941
Agency MBS    
Investment Securities Held To Maturity [Line Items]    
Amortized Cost 751 784
Gross Unrealized Gains 1 2
Gross Unrealized Losses (57) (55)
Fair  Value 695 731
Agency CMO    
Investment Securities Held To Maturity [Line Items]    
Amortized Cost 588 612
Gross Unrealized Gains 0 0
Gross Unrealized Losses (65) (62)
Fair  Value 523 550
Agency commercial MBS    
Investment Securities Held To Maturity [Line Items]    
Amortized Cost 1,837 1,715
Gross Unrealized Gains 12 18
Gross Unrealized Losses (22) (19)
Fair  Value 1,827 1,714
States of the U.S. and political subdivisions (municipals)    
Investment Securities Held To Maturity [Line Items]    
Amortized Cost 970 982
Gross Unrealized Gains 1 1
Gross Unrealized Losses (80) (60)
Fair  Value 891 923
Other debt securities    
Investment Securities Held To Maturity [Line Items]    
Amortized Cost 37 24
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (1)
Fair  Value $ 36 $ 23