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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 1,549 | $ 3,621
12 months or more | 9,835 | 11,046
Total | 11,384 | 14,667
Gross Unrealized Losses |  |
Less than 12 months | (9) | (28)
12 months or more | (989) | (1,300)
Total | (998) | (1,328)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 551 | 1,899
12 months or more | 518 | 431
Total | 1,069 | 2,330
Gross Unrealized Losses |  |
Less than 12 months | (2) | (12)
12 months or more | (31) | (39)
Total | (33) | (51)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 330 | 958
12 months or more | 2,378 | 2,269
Total | 2,708 | 3,227
Gross Unrealized Losses |  |
Less than 12 months | (2) | (12)
12 months or more | (349) | (413)
Total | (351) | (425)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 77 | 160
12 months or more | 417 | 523
Total | 494 | 683
Gross Unrealized Losses |  |
Less than 12 months | 0 | (1)
12 months or more | (18) | (21)
Total | (18) | (22)
Residential |  |
Fair Value |  |
Less than 12 months | 57 | 0
12 months or more | 361 | 373
Total | 418 | 373
Gross Unrealized Losses |  |
Less than 12 months | (2) | 0
12 months or more | (52) | (66)
Total | (54) | (66)
Commercial |  |
Fair Value |  |
Less than 12 months | 26 | 18
12 months or more | 1,124 | 1,303
Total | 1,150 | 1,321
Gross Unrealized Losses |  |
Less than 12 months | (1) | 0
12 months or more | (77) | (126)
Total | (78) | (126)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 218 | 120
12 months or more | 571 | 1,364
Total | 789 | 1,484
Gross Unrealized Losses |  |
Less than 12 months | (1) | (1)
12 months or more | (19) | (43)
Total | (20) | (44)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 290 | 466
12 months or more | 4,466 | 4,783
Total | 4,756 | 5,249
Gross Unrealized Losses |  |
Less than 12 months | (1) | (2)
12 months or more | (443) | (592)
Total | $ (444) | $ (594)

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