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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 4,062 | $ 4,990
12 months or more | 8,802 | 2,547
Total | 12,864 | 7,537
Gross Unrealized Losses |  |
Less than 12 months | (372) | (94)
12 months or more | (995) | (67)
Total | (1,367) | (161)
U.S. Treasury and agency obligations |  |
Fair Value |  |
Less than 12 months | 91 | 201
12 months or more | 431 | 355
Total | 522 | 556
Gross Unrealized Losses |  |
Less than 12 months | (4) | (3)
12 months or more | (39) | (7)
Total | (43) | (10)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 1,109 | 2,082
12 months or more | 1,785 | 556
Total | 2,894 | 2,638
Gross Unrealized Losses |  |
Less than 12 months | (129) | (49)
12 months or more | (263) | (20)
Total | (392) | (69)
Tax-exempt municipal securities |  |
Fair Value |  |
Less than 12 months | 38 | 68
12 months or more | 594 | 34
Total | 632 | 102
Gross Unrealized Losses |  |
Less than 12 months | (3) | (1)
12 months or more | (31) | (1)
Total | (34) | (2)
Residential |  |
Fair Value |  |
Less than 12 months | 250 | 358
12 months or more | 189 | 8
Total | 439 | 366
Gross Unrealized Losses |  |
Less than 12 months | (23) | (6)
12 months or more | (31) | 0
Total | (54) | (6)
Commercial |  |
Fair Value |  |
Less than 12 months | 282 | 295
12 months or more | 1,191 | 400
Total | 1,473 | 695
Gross Unrealized Losses |  |
Less than 12 months | (11) | (4)
12 months or more | (98) | (7)
Total | (109) | (11)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 517 | 530
12 months or more | 1,171 | 425
Total | 1,688 | 955
Gross Unrealized Losses |  |
Less than 12 months | (19) | (3)
12 months or more | (31) | (1)
Total | (50) | (4)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 1,775 | 1,456
12 months or more | 3,441 | 769
Total | 5,216 | 2,225
Gross Unrealized Losses |  |
Less than 12 months | (183) | (28)
12 months or more | (502) | (31)
Total | $ (685) | $ (59)

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