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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Mar. 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, Fair Value | [1] | $ 24,467 | $ 22,942
Debt Securities Held-to-maturity, Amortized Cost | [1] | 2,995 | 3,235
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 84 | 122
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (2) | 0
Debt Securities held-to-maturity, Fair Value |  | 3,077 | 3,357
Equity Securities, Amortized Cost |  | 73 | 66
Equity Securities, Fair Value |  | 73 | 66
Total equity securities, at cost, Amortized Cost |  | 603 | 604
Equity securities, at cost, fair value |  | 603 | 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, Fair Value |  | 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 |  | 3 | 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, Fair Value |  | 3 | 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 |  | 23,966 | 21,954
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 415 | 571
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (268) | (19)
Debt Securities Available-for-sale, Fair Value |  | 24,113 | 22,506
Debt Securities Held-to-maturity, Amortized Cost |  | 2,139 | 2,342
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 84 | 122
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | 0 | 0
Debt Securities held-to-maturity, Fair Value |  | 2,223 | 2,464
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 324 | 396
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 16 | 26
Debt Securities Available-for-sale, Gross Unrealized Losses |  | 0 | 0
Debt Securities Available-for-sale, Fair Value |  | 340 | 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 |  | 24,290 | 22,350
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 431 | 597
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (268) | (19)
Debt Securities Available-for-sale, Fair Value |  | 24,453 | 22,928
Debt Securities Held-to-maturity, Amortized Cost |  | 2,139 | 2,342
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 84 | 122
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | 0 | 0
Debt Securities held-to-maturity, Fair Value |  | 2,223 | 2,464
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 |  | 24,304 | 22,364
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 431 | 597
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (268) | (19)
Debt Securities Available-for-sale, Fair Value |  | 24,467 | 22,942
Asset-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Held-to-maturity, Amortized Cost |  | 856 | 893
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 0 | 0
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (2) | 0
Debt Securities held-to-maturity, Fair Value |  | $ 854 | $ 893
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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