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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Sep. 30, 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 | [1] | $ 23,478 | $ 26,067
Debt Securities Held-to-maturity, Amortized Cost | [1] | 10,071 | 2,242
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 4 | 54
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (702) | (7)
Debt Securities held-to-maturity, fair value |  | 9,373 | 2,289
Total equity securities, at cost, Amortized Cost |  | 1,113 | 624
Equity securities, at cost, fair value |  | 1,113 | 624
Equity Securities, Amortized Cost |  | 151 | 109
Equity Securities, Fair Value |  | 151 | 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 |  | 3,557 | 11
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (207) | 0
Debt securities available for sale |  | 3,350 | 11
State and political subdivisions |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3 | 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 |  | 3 | 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 |  | 21,019 | 24,607
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 0 | 210
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (2,335) | (375)
Debt securities available for sale |  | 18,684 | 24,442
Debt Securities Held-to-maturity, Amortized Cost |  | 9,457 | 1,505
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 4 | 52
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (657) | 0
Debt Securities held-to-maturity, fair value |  | 8,804 | 1,557
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 281 | 397
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 0 | 9
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (32) | (1)
Debt securities available for sale |  | 249 | 405
Total mortgage-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 21,300 | 25,004
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 0 | 219
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (2,367) | (376)
Debt securities available for sale |  | 18,933 | 24,847
Debt Securities Held-to-maturity, Amortized Cost |  | 9,457 | 1,505
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 4 | 52
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (657) | 0
Debt Securities held-to-maturity, fair value |  | 8,804 | 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 |  | (56) | (1)
Debt securities available for sale |  | 1,192 | 1,207
Total debt securities available for sale, at fair value |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 26,108 | 26,225
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 0 | 219
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (2,630) | (377)
Debt securities available for sale |  | 23,478 | 26,067
Asset-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Held-to-maturity, Amortized Cost |  | 614 | 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 |  | $ 569 | $ 732
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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