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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 4,989 | $ 4,419
12 months or more | 9,981 | 8,962
Total | 14,970 | 13,381
Gross Unrealized Losses |  |
Less than 12 months | (103) | (270)
12 months or more | (1,500) | (1,431)
Total | (1,603) | (1,701)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 1,334 | 512
12 months or more | 408 | 397
Total | 1,742 | 909
Gross Unrealized Losses |  |
Less than 12 months | (17) | (5)
12 months or more | (48) | (50)
Total | (65) | (55)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 1,349 | 1,231
12 months or more | 2,086 | 1,683
Total | 3,435 | 2,914
Gross Unrealized Losses |  |
Less than 12 months | (36) | (104)
12 months or more | (432) | (367)
Total | (468) | (471)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 337 | 64
12 months or more | 373 | 615
Total | 710 | 679
Gross Unrealized Losses |  |
Less than 12 months | (5) | (2)
12 months or more | (26) | (36)
Total | (31) | (38)
Residential |  |
Fair Value |  |
Less than 12 months | 17 | 124
12 months or more | 374 | 274
Total | 391 | 398
Gross Unrealized Losses |  |
Less than 12 months | (1) | (16)
12 months or more | (74) | (60)
Total | (75) | (76)
Commercial |  |
Fair Value |  |
Less than 12 months | 26 | 243
12 months or more | 1,365 | 1,157
Total | 1,391 | 1,400
Gross Unrealized Losses |  |
Less than 12 months | (1) | (13)
12 months or more | (159) | (142)
Total | (160) | (155)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 535 | 620
12 months or more | 1,263 | 1,011
Total | 1,798 | 1,631
Gross Unrealized Losses |  |
Less than 12 months | (12) | (32)
12 months or more | (55) | (46)
Total | (67) | (78)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 1,391 | 1,625
12 months or more | 4,112 | 3,825
Total | 5,503 | 5,450
Gross Unrealized Losses |  |
Less than 12 months | (31) | (98)
12 months or more | (706) | (730)
Total | $ (737) | $ (828)

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