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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | $ 22,364 | $ 20,517
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 597 | 167
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (19) | (71)
Debt securities available for sale: | [1] | 22,942 | 20,613
Debt Securities Held-to-Maturity, Amortized Cost | [1] | 3,235 | 3,202
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 122 | 45
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | 0 | (5)
Debt Securities Held-to-Maturity, Fair Value |  | 3,357 | 3,242
Equity Securities, at Fair Value, Amortized Cost |  | 66 | 47
Equity securities, at fair value |  | 66 | 47
Other investment securities, at cost, carrying value |  | 604 | 807
Other investment securities, at cost, estimated fair value |  | 604 | 807
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 | 71
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 | 71
State and political subdivisions |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 3 | 5
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 | 5
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 |  | 21,954 | 19,803
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 571 | 143
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (19) | (71)
Debt securities available for sale: |  | 22,506 | 19,875
Debt Securities Held-to-Maturity, Amortized Cost |  | 2,342 | 3,202
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 122 | 45
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | 0 | (5)
Debt Securities Held-to-Maturity, Fair Value |  | 2,464 | 3,242
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 396 | 638
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 26 | 24
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | 0 | 0
Debt securities available for sale: |  | 422 | 662
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 |  | 22,350 | 20,441
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 597 | 167
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (19) | (71)
Debt securities available for sale: |  | 22,928 | 20,537
Debt Securities Held-to-Maturity, Amortized Cost |  | 2,342 | 3,202
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 122 | 45
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | 0 | (5)
Debt Securities Held-to-Maturity, Fair Value |  | 2,464 | 3,242
Asset-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Held-to-Maturity, Amortized Cost |  | 893 | 0
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 0 | 0
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | 0 | 0
Debt Securities Held-to-Maturity, Fair Value |  | $ 893 | $ 0
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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