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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Fair Value | [1] | $ 21,698 | $ 19,895
Debt Securities Held-to-maturity, Amortized Cost |  | 3,447 | 4,165
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 18 | 8
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (24) | (132)
Debt Securities held-to-maturity, Fair Value |  | 3,441 | 4,041
Equity Securities, Amortized Cost |  | 47 | 181
Equity Securities, Fair Value |  | 47 | 181
Other equity securities, Amortized Cost |  | 8 | 7
Other equity securities, Fair Value |  | 8 | 7
Total equity securities, at cost, Amortized Cost |  | 706 | 834
Total equity securities, at cost, Fair Value |  | 706 | 834
U.S. Treasury and other |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 90 | 24
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 |  | 90 | 24
State and political subdivisions |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 5 | 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 |  | 5 | 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 |  | 20,688 | 20,211
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 163 | 28
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (143) | (605)
Debt Securities Available-for-sale, Fair Value |  | 20,708 | 19,634
Debt Securities Held-to-maturity, Amortized Cost |  | 3,447 | 3,425
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 18 | 0
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (24) | (132)
Debt Securities held-to-maturity, Fair Value |  | 3,441 | 3,293
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 871 | 236
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 28 | 3
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (4) | (7)
Debt Securities Available-for-sale, Fair Value |  | 895 | 232
Debt Securities Held-to-maturity, Amortized Cost |  | 0 | 740
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 0 | 8
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | 0 | 0
Debt Securities held-to-maturity, Fair Value |  | 0 | 748
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 |  | 21,559 | 20,447
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 191 | 31
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (147) | (612)
Debt Securities Available-for-sale, Fair Value |  | 21,603 | 19,866
Debt Securities Held-to-maturity, Amortized Cost |  | 3,447 | 4,165
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 18 | 8
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (24) | (132)
Debt Securities held-to-maturity, Fair Value |  | 3,441 | 4,041
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 |  | 21,654 | 20,476
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 191 | 31
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (147) | (612)
Debt Securities Available-for-sale, Fair Value |  | 21,698 | 19,895
Money market mutual fund investments |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Equity Securities, Amortized Cost |  | 47 | 181
Equity Securities, Fair Value |  | 47 | 181
Federal Reserve Bank stock |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Federal Reserve Bank stock, Amortized Cost |  | 577 | 463
Federal Reserve Bank stock, Fair Value |  | 577 | 463
Federal Home Loan Bank stock |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Federal Home Loan Bank stock, Amortized Cost |  | 121 | 364
Federal Home Loan Bank stock, Fair Value |  | $ 121 | $ 364
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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