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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 5,593 | $ 7,198
12 months or more | 8,788 | 9,104
Total | 14,381 | 16,302
Gross Unrealized Losses |  |
Less than 12 months | (82) | (178)
12 months or more | (1,081) | (1,231)
Total | (1,163) | (1,409)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 1,790 | 2,343
12 months or more | 432 | 456
Total | 2,222 | 2,799
Gross Unrealized Losses |  |
Less than 12 months | (28) | (68)
12 months or more | (33) | (42)
Total | (61) | (110)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 1,471 | 1,766
12 months or more | 2,200 | 2,203
Total | 3,671 | 3,969
Gross Unrealized Losses |  |
Less than 12 months | (23) | (50)
12 months or more | (405) | (459)
Total | (428) | (509)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 71 | 97
12 months or more | 393 | 405
Total | 464 | 502
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 | 42 | 130
12 months or more | 341 | 343
Total | 383 | 473
Gross Unrealized Losses |  |
Less than 12 months | (1) | (2)
12 months or more | (54) | (62)
Total | (55) | (64)
Commercial |  |
Fair Value |  |
Less than 12 months | 108 | 58
12 months or more | 930 | 992
Total | 1,038 | 1,050
Gross Unrealized Losses |  |
Less than 12 months | (1) | (1)
12 months or more | (71) | (84)
Total | (72) | (85)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 327 | 419
12 months or more | 388 | 436
Total | 715 | 855
Gross Unrealized Losses |  |
Less than 12 months | (3) | (5)
12 months or more | (15) | (19)
Total | (18) | (24)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 1,784 | 2,385
12 months or more | 4,104 | 4,269
Total | 5,888 | 6,654
Gross Unrealized Losses |  |
Less than 12 months | (25) | (51)
12 months or more | (480) | (544)
Total | $ (505) | $ (595)

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