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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)

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