v3.26.3
INVESTMENT SECURITIES - Schedule of Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Investments in Debt Securities, HTM (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 22,584 $ 13,212
Gross Unrealized Gains 138 28
Gross Unrealized Loss (1,990) (1,369)
Fair Value 20,732 11,871
U.S. Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,788 2,080
Gross Unrealized Gains 0 8
Gross Unrealized Loss (17) 0
Fair Value 1,771 2,088
ABS and other interests in structured securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,942 2,020
Gross Unrealized Gains 2 13
Gross Unrealized Loss (15) (2)
Fair Value 1,929 2,031
GNMA - Residential    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 4,544 3,106
Gross Unrealized Gains 0 4
Gross Unrealized Loss (531) (402)
Fair Value 4,013 2,708
GNMA - Commercial    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 9,551 4,525
Gross Unrealized Gains 135 0
Gross Unrealized Loss (1,181) (888)
Fair Value 8,505 3,637
FHLMC and FNMA - Residential    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,882 1,434
Gross Unrealized Gains 1 3
Gross Unrealized Loss (215) (77)
Fair Value 3,668 1,360
FHLMC and FNMA - Commercial    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 877 47
Gross Unrealized Gains 0 0
Gross Unrealized Loss (31) 0
Fair Value $ 846 $ 47