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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Fair Value | [1] | $ 34,208 | $ 32,765
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost | [1] | 8,469 | 8,599
Gross Unrealized Gains |  | 0 | 1
Gross Unrealized Gains |  | (954) | (1,060)
Fair Value |  | 7,515 | 7,540
Total equity securities, at cost, Amortized Cost |  | 711 | 710
Equity securities, at cost, fair value |  | 711 | 710
Equity Securities, Amortized Cost |  | 236 | 220
Equity Securities, Fair Value |  | 236 | 220
Portfolio level basis adjustments excluded from amortized cost |  | (2) | (75)
Total debt securities available for sale, at fair value |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 35,986 | 34,986
Gross Unrealized Gains |  | 96 | 36
Gross Unrealized Losses |  | (1,874) | (2,257)
Fair Value |  | 34,208 | 32,765
U.S. Treasury and other |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 4,145 | 3,631
Gross Unrealized Gains |  | 15 | 3
Gross Unrealized Losses |  | (91) | (109)
Fair Value |  | 4,069 | 3,525
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 |  | 31,716 | 31,170
Gross Unrealized Gains |  | 81 | 33
Gross Unrealized Losses |  | (1,783) | (2,148)
Fair Value |  | 30,014 | 29,055
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 8,077 | 8,187
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Gains |  | (948) | (1,051)
Fair Value |  | 7,129 | 7,136
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 |  | 31,444 | 30,897
Gross Unrealized Gains |  | 81 | 33
Gross Unrealized Losses |  | (1,772) | (2,135)
Fair Value |  | 29,753 | 28,795
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 8,077 | 8,187
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Gains |  | (948) | (1,051)
Fair Value |  | 7,129 | 7,136
Other/non-agency |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 272 | 273
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (11) | (13)
Fair Value |  | 261 | 260
Collateralized loan obligations |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 124 | 184
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 124 | 184
Asset-backed securities |  |  |
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 392 | 412
Gross Unrealized Gains |  | 0 | 1
Gross Unrealized Gains |  | (6) | (9)
Fair Value |  | $ 386 | $ 404
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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