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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair Value    
Less than 12 months $ 4,704 $ 3,621
12 months or more 10,564 11,046
Total 15,268 14,667
Gross Unrealized Losses    
Less than 12 months (68) (28)
12 months or more (1,367) (1,300)
Total (1,435) (1,328)
U.S. Treasury and agency obligations    
Fair Value    
Less than 12 months 2,301 1,899
12 months or more 447 431
Total 2,748 2,330
Gross Unrealized Losses    
Less than 12 months (43) (12)
12 months or more (41) (39)
Total (84) (51)
Mortgage-backed securities    
Fair Value    
Less than 12 months 862 958
12 months or more 2,513 2,269
Total 3,375 3,227
Gross Unrealized Losses    
Less than 12 months (15) (12)
12 months or more (471) (413)
Total (486) (425)
Tax-exempt municipal securities    
Fair Value    
Less than 12 months 261 160
12 months or more 508 523
Total 769 683
Gross Unrealized Losses    
Less than 12 months (1) (1)
12 months or more (23) (21)
Total (24) (22)
Residential    
Fair Value    
Less than 12 months 9 0
12 months or more 365 373
Total 374 373
Gross Unrealized Losses    
Less than 12 months 0 0
12 months or more (68) (66)
Total (68) (66)
Commercial    
Fair Value    
Less than 12 months 0 18
12 months or more 1,242 1,303
Total 1,242 1,321
Gross Unrealized Losses    
Less than 12 months 0 0
12 months or more (113) (126)
Total (113) (126)
Asset-backed securities    
Fair Value    
Less than 12 months 447 120
12 months or more 787 1,364
Total 1,234 1,484
Gross Unrealized Losses    
Less than 12 months (2) (1)
12 months or more (35) (43)
Total (37) (44)
Corporate debt securities    
Fair Value    
Less than 12 months 824 466
12 months or more 4,702 4,783
Total 5,526 5,249
Gross Unrealized Losses    
Less than 12 months (7) (2)
12 months or more (616) (592)
Total $ (623) $ (594)