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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | $ 26,225 | $ 22,364
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 219 | 597
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (377) | (19)
Debt securities available for sale: | [1] | 26,067 | 22,942
Debt Securities Held-to-Maturity, Amortized Cost | [1] | 2,242 | 3,235
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 54 | 122
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (7) | 0
Debt Securities Held-to-Maturity, Fair Value |  | 2,289 | 3,357
Equity securities, at fair value, Amortized Cost |  | 109 | 66
Equity securities, at fair value, Fair Value |  | 109 | 66
Other investment securities, at cost, carrying value |  | 624 | 604
Other investment securities, at cost, estimated fair value |  | 624 | 604
U.S. Treasury and other |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 11 | 11
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: |  | 11 | 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 | 3
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: |  | 2 | 3
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 |  | 24,607 | 21,954
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 210 | 571
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (375) | (19)
Debt securities available for sale: |  | 24,442 | 22,506
Debt Securities Held-to-Maturity, Amortized Cost |  | 1,505 | 2,342
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 52 | 122
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | 0 | 0
Debt Securities Held-to-Maturity, Fair Value |  | 1,557 | 2,464
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 397 | 396
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 9 | 26
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (1) | 0
Debt securities available for sale: |  | 405 | 422
Total mortgage-backed securities, at fair value |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 25,004 | 22,350
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 219 | 597
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (376) | (19)
Debt securities available for sale: |  | 24,847 | 22,928
Debt Securities Held-to-Maturity, Amortized Cost |  | 1,505 | 2,342
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 52 | 122
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | 0 | 0
Debt Securities Held-to-Maturity, Fair Value |  | 1,557 | 2,464
Collateralized loan obligations |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 1,208 | 0
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 0 | 0
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (1) | 0
Debt securities available for sale: |  | 1,207 | 0
Asset-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Held-to-Maturity, Amortized Cost |  | 737 | 893
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 2 | 0
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (7) | 0
Debt Securities Held-to-Maturity, Fair Value |  | $ 732 | $ 893
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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