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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 4,340 | $ 3,621
12 months or more | 11,207 | 11,046
Total | 15,547 | 14,667
Gross Unrealized Losses |  |
Less than 12 months | (66) | (28)
12 months or more | (1,419) | (1,300)
Total | (1,485) | (1,328)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 1,592 | 1,899
12 months or more | 1,135 | 431
Total | 2,727 | 2,330
Gross Unrealized Losses |  |
Less than 12 months | (32) | (12)
12 months or more | (60) | (39)
Total | (92) | (51)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 734 | 958
12 months or more | 2,732 | 2,269
Total | 3,466 | 3,227
Gross Unrealized Losses |  |
Less than 12 months | (14) | (12)
12 months or more | (495) | (413)
Total | (509) | (425)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 208 | 160
12 months or more | 503 | 523
Total | 711 | 683
Gross Unrealized Losses |  |
Less than 12 months | (2) | (1)
12 months or more | (25) | (21)
Total | (27) | (22)
Residential |  |
Fair Value |  |
Less than 12 months | 21 | 0
12 months or more | 353 | 373
Total | 374 | 373
Gross Unrealized Losses |  |
Less than 12 months | (1) | 0
12 months or more | (69) | (66)
Total | (70) | (66)
Commercial |  |
Fair Value |  |
Less than 12 months | 54 | 18
12 months or more | 1,179 | 1,303
Total | 1,233 | 1,321
Gross Unrealized Losses |  |
Less than 12 months | (1) | 0
12 months or more | (111) | (126)
Total | (112) | (126)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 398 | 120
12 months or more | 735 | 1,364
Total | 1,133 | 1,484
Gross Unrealized Losses |  |
Less than 12 months | (2) | (1)
12 months or more | (33) | (43)
Total | (35) | (44)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 1,333 | 466
12 months or more | 4,570 | 4,783
Total | 5,903 | 5,249
Gross Unrealized Losses |  |
Less than 12 months | (14) | (2)
12 months or more | (626) | (592)
Total | $ (640) | $ (594)

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