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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 4,212 | $ 4,419
12 months or more | 10,836 | 8,962
Total | 15,048 | 13,381
Gross Unrealized Losses |  |
Less than 12 months | (165) | (270)
12 months or more | (1,800) | (1,431)
Total | (1,965) | (1,701)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 1,483 | 512
12 months or more | 407 | 397
Total | 1,890 | 909
Gross Unrealized Losses |  |
Less than 12 months | (51) | (5)
12 months or more | (54) | (50)
Total | (105) | (55)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 1,084 | 1,231
12 months or more | 2,169 | 1,683
Total | 3,253 | 2,914
Gross Unrealized Losses |  |
Less than 12 months | (66) | (104)
12 months or more | (571) | (367)
Total | (637) | (471)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 278 | 64
12 months or more | 515 | 615
Total | 793 | 679
Gross Unrealized Losses |  |
Less than 12 months | (6) | (2)
12 months or more | (44) | (36)
Total | (50) | (38)
Residential |  |
Fair Value |  |
Less than 12 months | 48 | 124
12 months or more | 363 | 274
Total | 411 | 398
Gross Unrealized Losses |  |
Less than 12 months | (1) | (16)
12 months or more | (84) | (60)
Total | (85) | (76)
Commercial |  |
Fair Value |  |
Less than 12 months | 15 | 243
12 months or more | 1,304 | 1,157
Total | 1,319 | 1,400
Gross Unrealized Losses |  |
Less than 12 months | 0 | (13)
12 months or more | (155) | (142)
Total | (155) | (155)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 343 | 620
12 months or more | 1,430 | 1,011
Total | 1,773 | 1,631
Gross Unrealized Losses |  |
Less than 12 months | (6) | (32)
12 months or more | (59) | (46)
Total | (65) | (78)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 961 | 1,625
12 months or more | 4,648 | 3,825
Total | 5,609 | 5,450
Gross Unrealized Losses |  |
Less than 12 months | (35) | (98)
12 months or more | (833) | (730)
Total | $ (868) | $ (828)

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