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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Securities Held-to-maturity, Amortized Cost | $ 4,417 | $ 4,685
Securities Held-to-maturity, Gross Unrealized Gain | 5 | 29
Securities Held-to-maturity, Gross Unrealized Losses | (162) | (46)
Securities held-to-maturity, Fair Value | 4,260 | 4,668
Money market mutual fund, Amortized Cost | 170 | 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 | 170 | 165
Total other investment securities, at fair value, Amortized Cost | 170 | 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 | 170 | 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 | 769 | 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 | 769 | 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 | 6 | 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 | 6 | 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 | 20,559 | 20,065
Debt Securities Available-for-sale, Gross Unrealized Gains | 17 | 40
Debt Securities Available-for-sale, Gross Unrealized Losses | (705) | (277)
Debt Securities Available-for-sale, Fair Value | 19,871 | 19,828
Securities Held-to-maturity, Amortized Cost | 3,632 | 3,853
Securities Held-to-maturity, Gross Unrealized Gain | 0 | 7
Securities Held-to-maturity, Gross Unrealized Losses | (159) | (46)
Securities held-to-maturity, Fair Value | 3,473 | 3,814
Other/non-agency |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities Available-for-sale, Amortized Cost | 269 | 311
Debt Securities Available-for-sale, Gross Unrealized Gains | 5 | 7
Debt Securities Available-for-sale, Gross Unrealized Losses | (6) | (7)
Debt Securities Available-for-sale, Fair Value | 268 | 311
Securities Held-to-maturity, Amortized Cost | 785 | 832
Securities Held-to-maturity, Gross Unrealized Gain | 5 | 22
Securities Held-to-maturity, Gross Unrealized Losses | (3) | 0
Securities held-to-maturity, Fair Value | 787 | 854
Total mortgage-backed securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities Available-for-sale, Amortized Cost | 20,828 | 20,376
Debt Securities Available-for-sale, Gross Unrealized Gains | 22 | 47
Debt Securities Available-for-sale, Gross Unrealized Losses | (711) | (284)
Debt Securities Available-for-sale, Fair Value | 20,139 | 20,139
Securities Held-to-maturity, Amortized Cost | 4,417 | 4,685
Securities Held-to-maturity, Gross Unrealized Gain | 5 | 29
Securities Held-to-maturity, Gross Unrealized Losses | (162) | (46)
Securities held-to-maturity, Fair Value | 4,260 | 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 | 20,846 | 20,394
Debt Securities Available-for-sale, Gross Unrealized Gains | 22 | 47
Debt Securities Available-for-sale, Gross Unrealized Losses | (711) | (284)
Debt Securities Available-for-sale, Fair Value | 20,157 | 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 | 299 | 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 | $ 299 | $ 252

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