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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Mar. 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, Fair Value | [1] | $ 22,307 | $ 20,613
Debt Securities Held-to-maturity, Amortized Cost | [1] | 3,071 | 3,202
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 148 | 45
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | 0 | (5)
Debt Securities held-to-maturity, Fair Value |  | 3,219 | 3,242
Equity Securities, Amortized Cost |  | 47 | 47
Equity Securities, Fair Value |  | 47 | 47
Other equity securities, Amortized Cost |  | 8 | 8
Other equity securities, Fair Value |  | 8 | 8
Total equity securities, at cost, Amortized Cost |  | 927 | 807
Total equity securities, at cost, Fair Value |  | 927 | 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 |  | 41 | 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, Fair Value |  | 41 | 71
State and political subdivisions |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 4 | 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, Fair Value |  | 4 | 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 |  | 21,029 | 19,803
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 625 | 143
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (3) | (71)
Debt Securities Available-for-sale, Fair Value |  | 21,651 | 19,875
Debt Securities Held-to-maturity, Amortized Cost |  | 3,071 | 3,202
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 148 | 45
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | 0 | (5)
Debt Securities held-to-maturity, Fair Value |  | 3,219 | 3,242
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 612 | 638
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 3 | 24
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (4) | 0
Debt Securities Available-for-sale, Fair Value |  | 611 | 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 |  | 21,641 | 20,441
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 628 | 167
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (7) | (71)
Debt Securities Available-for-sale, Fair Value |  | 22,262 | 20,537
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 |  | 21,686 | 20,517
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 628 | 167
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (7) | (71)
Debt Securities Available-for-sale, Fair Value |  | 22,307 | 20,613
Money market mutual fund investments |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Equity Securities, Amortized Cost |  | 47 | 47
Equity Securities, Fair Value |  | 47 | 47
Federal Reserve Bank stock |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Federal Reserve Bank stock, Amortized Cost |  | 577 | 577
Federal Reserve Bank stock, Fair Value |  | 577 | 577
Federal Home Loan Bank stock |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Federal Home Loan Bank stock, Amortized Cost |  | 342 | 222
Federal Home Loan Bank stock, Fair Value |  | $ 342 | $ 222
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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