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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 3,621 | $ 4,419
12 months or more | 11,046 | 8,962
Total | 14,667 | 13,381
Gross Unrealized Losses |  |
Less than 12 months | (28) | (270)
12 months or more | (1,300) | (1,431)
Total | (1,328) | (1,701)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 1,899 | 512
12 months or more | 431 | 397
Total | 2,330 | 909
Gross Unrealized Losses |  |
Less than 12 months | (12) | (5)
12 months or more | (39) | (50)
Total | (51) | (55)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 958 | 1,231
12 months or more | 2,269 | 1,683
Total | 3,227 | 2,914
Gross Unrealized Losses |  |
Less than 12 months | (12) | (104)
12 months or more | (413) | (367)
Total | (425) | (471)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 160 | 64
12 months or more | 523 | 615
Total | 683 | 679
Gross Unrealized Losses |  |
Less than 12 months | (1) | (2)
12 months or more | (21) | (36)
Total | (22) | (38)
Residential |  |
Fair Value |  |
Less than 12 months | 0 | 124
12 months or more | 373 | 274
Total | 373 | 398
Gross Unrealized Losses |  |
Less than 12 months | 0 | (16)
12 months or more | (66) | (60)
Total | (66) | (76)
Commercial |  |
Fair Value |  |
Less than 12 months | 18 | 243
12 months or more | 1,303 | 1,157
Total | 1,321 | 1,400
Gross Unrealized Losses |  |
Less than 12 months | 0 | (13)
12 months or more | (126) | (142)
Total | (126) | (155)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 120 | 620
12 months or more | 1,364 | 1,011
Total | 1,484 | 1,631
Gross Unrealized Losses |  |
Less than 12 months | (1) | (32)
12 months or more | (43) | (46)
Total | (44) | (78)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 466 | 1,625
12 months or more | 4,783 | 3,825
Total | 5,249 | 5,450
Gross Unrealized Losses |  |
Less than 12 months | (2) | (98)
12 months or more | (592) | (730)
Total | $ (594) | $ (828)

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