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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Fair Value | [1] | $ 32,765 | $ 29,777
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost | [1] | 8,599 | 9,184
Gross Unrealized Gains |  | 1 | 9
Gross Unrealized Losses |  | (1,060) | (843)
Fair Value |  | 7,540 | 8,350
Total equity securities, at cost, Amortized Cost |  | 710 | 869
Equity securities, at cost, Fair Value |  | 710 | 869
Equity securities, Amortized Cost |  | 220 | 173
Equity securities, Fair Value |  | 220 | 173
Portfolio level basis adjustments excluded from amortized cost |  | (75) | 60
Debt Securities |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 34,986 | 31,729
Gross Unrealized Gains |  | 36 | 71
Gross Unrealized Losses |  | (2,257) | (2,023)
Fair Value |  | 32,765 | 29,777
U.S. Treasury and other |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 3,631 | 4,493
Gross Unrealized Gains |  | 3 | 26
Gross Unrealized Losses |  | (109) | (139)
Fair Value |  | 3,525 | 4,380
State and political subdivisions |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 1 | 1
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 1 | 1
Total mortgage-backed securities |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 31,170 | 26,568
Gross Unrealized Gains |  | 33 | 45
Gross Unrealized Losses |  | (2,148) | (1,881)
Fair Value |  | 29,055 | 24,732
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 8,187 | 8,696
Gross Unrealized Gains |  | 0 | 9
Gross Unrealized Losses |  | (1,051) | (818)
Fair Value |  | 7,136 | 7,887
Federal agencies and U.S. government sponsored entities |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 30,897 | 26,289
Gross Unrealized Gains |  | 33 | 45
Gross Unrealized Losses |  | (2,135) | (1,857)
Fair Value |  | 28,795 | 24,477
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 8,187 | 8,696
Gross Unrealized Gains |  | 0 | 9
Gross Unrealized Losses |  | (1,051) | (818)
Fair Value |  | 7,136 | 7,887
Other/non-agency |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 273 | 279
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (13) | (24)
Fair Value |  | 260 | 255
Collateralized loan obligations |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 184 | 667
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | (3)
Fair Value |  | 184 | 664
Asset-backed securities |  |  |
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 412 | 488
Gross Unrealized Gains |  | 1 | 0
Gross Unrealized Losses |  | (9) | (25)
Fair Value |  | $ 404 | $ 463
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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