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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Fair Value | [1] | $ 20,152 | $ 20,157
Debt Securities Held-to-maturity, Amortized Cost |  | 4,284 | 4,685
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 1 | 29
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (183) | (46)
Debt Securities held-to-maturity, Fair Value |  | 4,102 | 4,668
Money market mutual fund, Amortized Cost |  | 175 | 165
Money Market Mutual Fund, Gross Unrealized Gain |  | 0 | 0
Money Market Mutual Fund, Gross Unrealized Loss |  | 0 | 0
Money market mutual fund, Fair Value |  | 175 | 165
Total other investment securities, at fair value, Amortized Cost |  | 175 | 169
Total other investments securities, at fair value, at cost, Gross Unrealized Gains |  | 0 | 0
Total other investments securities, at fair value, Gross Unrealized Losses |  | 0 | 0
Total other investment securities, at fair value, Fair Value |  | 175 | 169
Other Equity Securities, at Cost, Amortized Cost |  | 7 | 7
Other Equity Securities, at Cost, Gross Unrealized Gain |  | 0 | 0
Other Equity Securities, at Cost, Gross Unrealized Loss |  | 0 | 0
Other Equity Securities, at Cost, Fair Value |  | 7 | 7
Total equity securities, at cost |  | 874 | 722
Total equity securities, at cost, Gross Unrealized Gain |  | 0 | 0
Total equity securities, at cost, Gross Unrealized Losses |  | 0 | 0
Total equity securities, at cost, Fair Value |  | 874 | 722
U.S. Treasury and other |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 12 | 12
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 |  | 12 | 12
State and political subdivisions |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 5 | 6
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 | 6
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 |  | 20,703 | 20,065
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 8 | 40
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (825) | (277)
Debt Securities Available-for-sale, Fair Value |  | 19,886 | 19,828
Debt Securities Held-to-maturity, Amortized Cost |  | 3,525 | 3,853
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 0 | 7
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (177) | (46)
Debt Securities held-to-maturity, Fair Value |  | 3,348 | 3,814
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 251 | 311
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 4 | 7
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (6) | (7)
Debt Securities Available-for-sale, Fair Value |  | 249 | 311
Debt Securities Held-to-maturity, Amortized Cost |  | 759 | 832
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 1 | 22
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (6) | 0
Debt Securities held-to-maturity, Fair Value |  | 754 | 854
Total mortgage-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-sale, Amortized Cost |  | 20,954 | 20,376
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 12 | 47
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (831) | (284)
Debt Securities Available-for-sale, Fair Value |  | 20,135 | 20,139
Debt Securities Held-to-maturity, Amortized Cost |  | 4,284 | 4,685
Debt Securities Held-to-maturity, Gross Unrealized Gain |  | 1 | 29
Debt Securities Held-to-maturity, Gross Unrealized Losses |  | (183) | (46)
Debt Securities held-to-maturity, Fair Value |  | 4,102 | 4,668
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 |  | 20,971 | 20,394
Debt Securities Available-for-sale, Gross Unrealized Gains |  | 12 | 47
Debt Securities Available-for-sale, Gross Unrealized Losses |  | (831) | (284)
Debt Securities Available-for-sale, Fair Value |  | 20,152 | 20,157
Other investments |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Other Investments, Amortized Cost |  | 0 | 4
Other Investments, Gross Unrealized Gain |  | 0 | 0
Other Investments, Gross Unrealized Loss |  | 0 | 0
Other Investments, Fair Value |  | 0 | 4
Federal Reserve Bank stock |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Federal Reserve Bank stock, Amortized Cost |  | 463 | 463
Federal Reserve Bank stock, Gross Unrealized Gains |  | 0 | 0
Federal Reserve Bank stock, Gross Unrealized Losses |  | 0 | 0
Federal Reserve Bank stock, Fair Value |  | 463 | 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 |  | 404 | 252
Federal Home Loan Bank stock, Gross Unrealized Gain |  | 0 | 0
Federal Home Loan Bank stock, Gross Unrealized Losses |  | 0 | 0
Federal Home Loan Bank stock, Fair Value |  | $ 404 | $ 252
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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