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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 26,458 | $ 26,225
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 11 | 219
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (2,462) | (377)
Debt securities, available for sale, at fair value pledged to creditors | [1] | 24,007 | 26,067
Debt Securities Held-to-Maturity, Amortized Cost | [1] | 9,834 | 2,242
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 4 | 54
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (796) | (7)
Debt Securities Held-to-Maturity, Fair Value | [1] | 9,042 | 2,289
Other investment securities, at cost, carrying value |  | 1,058 | 624
Other investment securities, at cost, estimated fair value |  | 1,058 | 624
Equity securities, at fair value, Amortized Cost |  | 153 | 109
Equity securities, at fair value, Fair Value |  | 153 | 109
U.S. Treasury and other |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,678 | 11
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 1 | 0
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (193) | 0
Debt securities, available for sale, at fair value pledged to creditors |  | 3,486 | 11
State and political subdivisions |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 2 | 2
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 0 | 0
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | 0 | 0
Debt securities, available for sale, at fair value pledged to creditors |  | 2 | 2
Federal agencies and U.S. government sponsored entities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 21,250 | 24,607
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 10 | 210
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (2,198) | (375)
Debt securities, available for sale, at fair value pledged to creditors |  | 19,062 | 24,442
Debt Securities Held-to-Maturity, Amortized Cost |  | 9,253 | 1,505
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 4 | 52
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (751) | 0
Debt Securities Held-to-Maturity, Fair Value |  | 8,506 | 1,557
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 280 | 397
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 0 | 9
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (29) | (1)
Debt securities, available for sale, at fair value pledged to creditors |  | 251 | 405
Total mortgage-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 21,530 | 25,004
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 10 | 219
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (2,227) | (376)
Debt securities, available for sale, at fair value pledged to creditors |  | 19,313 | 24,847
Debt Securities Held-to-Maturity, Amortized Cost |  | 9,253 | 1,505
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 4 | 52
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (751) | 0
Debt Securities Held-to-Maturity, Fair Value |  | 8,506 | 1,557
Collateralized loan obligations |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 1,248 | 1,208
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 0 | 0
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (42) | (1)
Debt securities, available for sale, at fair value pledged to creditors |  | 1,206 | 1,207
Asset-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Held-to-Maturity, Amortized Cost |  | 581 | 737
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 0 | 2
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (45) | (7)
Debt Securities Held-to-Maturity, Fair Value |  | $ 536 | $ 732
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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