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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 4,419 | $ 4,990
12 months or more | 8,962 | 2,547
Total | 13,381 | 7,537
Gross Unrealized Losses |  |
Less than 12 months | (270) | (94)
12 months or more | (1,431) | (67)
Total | (1,701) | (161)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 512 | 201
12 months or more | 397 | 355
Total | 909 | 556
Gross Unrealized Losses |  |
Less than 12 months | (5) | (3)
12 months or more | (50) | (7)
Total | (55) | (10)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 1,231 | 2,082
12 months or more | 1,683 | 556
Total | 2,914 | 2,638
Gross Unrealized Losses |  |
Less than 12 months | (104) | (49)
12 months or more | (367) | (20)
Total | (471) | (69)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 64 | 68
12 months or more | 615 | 34
Total | 679 | 102
Gross Unrealized Losses |  |
Less than 12 months | (2) | (1)
12 months or more | (36) | (1)
Total | (38) | (2)
Residential |  |
Fair Value |  |
Less than 12 months | 124 | 358
12 months or more | 274 | 8
Total | 398 | 366
Gross Unrealized Losses |  |
Less than 12 months | (16) | (6)
12 months or more | (60) | 0
Total | (76) | (6)
Commercial |  |
Fair Value |  |
Less than 12 months | 243 | 295
12 months or more | 1,157 | 400
Total | 1,400 | 695
Gross Unrealized Losses |  |
Less than 12 months | (13) | (4)
12 months or more | (142) | (7)
Total | (155) | (11)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 620 | 530
12 months or more | 1,011 | 425
Total | 1,631 | 955
Gross Unrealized Losses |  |
Less than 12 months | (32) | (3)
12 months or more | (46) | (1)
Total | (78) | (4)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 1,625 | 1,456
12 months or more | 3,825 | 769
Total | 5,450 | 2,225
Gross Unrealized Losses |  |
Less than 12 months | (98) | (28)
12 months or more | (730) | (31)
Total | $ (828) | $ (59)

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