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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Fair Value | [1] | $ 29,777 | $ 24,007
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost | [1] | 9,184 | 9,834
Gross Unrealized Gains |  | 9 | 4
Gross Unrealized Losses |  | (843) | (796)
Fair Value | [1] | 8,350 | 9,042
Total equity securities, at cost, Amortized Cost |  | 869 | 1,058
Equity securities, at cost, Fair Value |  | 869 | 1,058
Equity securities, Amortized Cost |  | 173 | 153
Equity securities, Fair Value |  | 173 | 153
Portfolio level basis adjustments excluded from amortized cost |  | 60 |
Debt Securities |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 31,729 | 26,458
Gross Unrealized Gains |  | 71 | 11
Gross Unrealized Losses |  | (2,023) | (2,462)
Fair Value |  | 29,777 | 24,007
U.S. Treasury and other |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 4,493 | 3,678
Gross Unrealized Gains |  | 26 | 1
Gross Unrealized Losses |  | (139) | (193)
Fair Value |  | 4,380 | 3,486
State and political subdivisions |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 1 | 2
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 1 | 2
Total mortgage-backed securities |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 26,568 | 21,530
Gross Unrealized Gains |  | 45 | 10
Gross Unrealized Losses |  | (1,881) | (2,227)
Fair Value |  | 24,732 | 19,313
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 8,696 | 9,253
Gross Unrealized Gains |  | 9 | 4
Gross Unrealized Losses |  | (818) | (751)
Fair Value |  | 7,887 | 8,506
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 |  | 26,289 | 21,250
Gross Unrealized Gains |  | 45 | 10
Gross Unrealized Losses |  | (1,857) | (2,198)
Fair Value |  | 24,477 | 19,062
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 8,696 | 9,253
Gross Unrealized Gains |  | 9 | 4
Gross Unrealized Losses |  | (818) | (751)
Fair Value |  | 7,887 | 8,506
Other/non-agency |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 279 | 280
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (24) | (29)
Fair Value |  | 255 | 251
Collateralized loan obligations |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 667 | 1,248
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (3) | (42)
Fair Value |  | 664 | 1,206
Asset-backed securities |  |  |
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 488 | 581
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (25) | (45)
Fair Value |  | $ 463 | $ 536
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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