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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Sep. 30, 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] | $ 35,419 | $ 32,765
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost | [1] | 8,124 | 8,599
Gross Unrealized Gains |  | 1 | 1
Gross Unrealized Gains |  | (830) | (1,060)
Fair Value |  | 7,295 | 7,540
Total equity securities, at cost, Amortized Cost |  | 710 | 710
Equity securities, at cost, fair value |  | 710 | 710
Equity Securities, Amortized Cost |  | 286 | 220
Equity Securities, Fair Value |  | 286 | 220
Portfolio level basis adjustments excluded from amortized cost |  | 37 | (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 |  | 36,787 | 34,986
Gross Unrealized Gains |  | 183 | 36
Gross Unrealized Losses |  | (1,551) | (2,257)
Fair Value |  | 35,419 | 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 |  | 4,563 | 3,631
Gross Unrealized Gains |  | 23 | 3
Gross Unrealized Losses |  | (72) | (109)
Fair Value |  | 4,514 | 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 |  | 32,133 | 31,170
Gross Unrealized Gains |  | 160 | 33
Gross Unrealized Losses |  | (1,479) | (2,148)
Fair Value |  | 30,814 | 29,055
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 7,767 | 8,187
Gross Unrealized Gains |  | 1 | 0
Gross Unrealized Gains |  | (830) | (1,051)
Fair Value |  | 6,938 | 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 |  | 31,865 | 30,897
Gross Unrealized Gains |  | 160 | 33
Gross Unrealized Losses |  | (1,474) | (2,135)
Fair Value |  | 30,551 | 28,795
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 7,767 | 8,187
Gross Unrealized Gains |  | 1 | 0
Gross Unrealized Gains |  | (830) | (1,051)
Fair Value |  | 6,938 | 7,136
Other/non-agency |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 268 | 273
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (5) | (13)
Fair Value |  | 263 | 260
Collateralized loan obligations |  |  |
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 90 | 184
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 90 | 184
Asset-backed securities |  |  |
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |  |
Amortized Cost |  | 357 | 412
Gross Unrealized Gains |  | 0 | 1
Gross Unrealized Gains |  | 0 | (9)
Fair Value |  | $ 357 | $ 404
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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