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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 2,988 | $ 7,198
12 months or more | 8,762 | 9,104
Total | 11,750 | 16,302
Gross Unrealized Losses |  |
Less than 12 months | (19) | (178)
12 months or more | (900) | (1,231)
Total | (919) | (1,409)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 1,270 | 2,343
12 months or more | 710 | 456
Total | 1,980 | 2,799
Gross Unrealized Losses |  |
Less than 12 months | (9) | (68)
12 months or more | (31) | (42)
Total | (40) | (110)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 623 | 1,766
12 months or more | 2,388 | 2,203
Total | 3,011 | 3,969
Gross Unrealized Losses |  |
Less than 12 months | (4) | (50)
12 months or more | (359) | (459)
Total | (363) | (509)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 64 | 97
12 months or more | 354 | 405
Total | 418 | 502
Gross Unrealized Losses |  |
Less than 12 months | (1) | (1)
12 months or more | (16) | (21)
Total | (17) | (22)
Residential |  |
Fair Value |  |
Less than 12 months | 7 | 130
12 months or more | 331 | 343
Total | 338 | 473
Gross Unrealized Losses |  |
Less than 12 months | 0 | (2)
12 months or more | (49) | (62)
Total | (49) | (64)
Commercial |  |
Fair Value |  |
Less than 12 months | 83 | 58
12 months or more | 862 | 992
Total | 945 | 1,050
Gross Unrealized Losses |  |
Less than 12 months | 0 | (1)
12 months or more | (53) | (84)
Total | (53) | (85)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 153 | 419
12 months or more | 278 | 436
Total | 431 | 855
Gross Unrealized Losses |  |
Less than 12 months | (2) | (5)
12 months or more | (11) | (19)
Total | (13) | (24)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 788 | 2,385
12 months or more | 3,839 | 4,269
Total | 4,627 | 6,654
Gross Unrealized Losses |  |
Less than 12 months | (3) | (51)
12 months or more | (381) | (544)
Total | $ (384) | $ (595)

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