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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 3,680 | $ 4,419
12 months or more | 9,082 | 8,962
Total | 12,762 | 13,381
Gross Unrealized Losses |  |
Less than 12 months | (98) | (270)
12 months or more | (1,381) | (1,431)
Total | (1,479) | (1,701)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 290 | 512
12 months or more | 396 | 397
Total | 686 | 909
Gross Unrealized Losses |  |
Less than 12 months | (2) | (5)
12 months or more | (45) | (50)
Total | (47) | (55)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 867 | 1,231
12 months or more | 2,123 | 1,683
Total | 2,990 | 2,914
Gross Unrealized Losses |  |
Less than 12 months | (17) | (104)
12 months or more | (406) | (367)
Total | (423) | (471)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 343 | 64
12 months or more | 314 | 615
Total | 657 | 679
Gross Unrealized Losses |  |
Less than 12 months | (5) | (2)
12 months or more | (22) | (36)
Total | (27) | (38)
Residential |  |
Fair Value |  |
Less than 12 months | 25 | 124
12 months or more | 369 | 274
Total | 394 | 398
Gross Unrealized Losses |  |
Less than 12 months | (2) | (16)
12 months or more | (71) | (60)
Total | (73) | (76)
Commercial |  |
Fair Value |  |
Less than 12 months | 119 | 243
12 months or more | 1,275 | 1,157
Total | 1,394 | 1,400
Gross Unrealized Losses |  |
Less than 12 months | (4) | (13)
12 months or more | (145) | (142)
Total | (149) | (155)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 583 | 620
12 months or more | 971 | 1,011
Total | 1,554 | 1,631
Gross Unrealized Losses |  |
Less than 12 months | (21) | (32)
12 months or more | (43) | (46)
Total | (64) | (78)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 1,453 | 1,625
12 months or more | 3,634 | 3,825
Total | 5,087 | 5,450
Gross Unrealized Losses |  |
Less than 12 months | (47) | (98)
12 months or more | (649) | (730)
Total | $ (696) | $ (828)

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