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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 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, Amortized Cost |  | $ 20,476 | $ 20,394
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 31 | 47
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (612) | (284)
Debt securities available for sale: | [1] | 19,895 | 20,157
Debt Securities Held-to-Maturity, Amortized Cost |  | 4,165 | 4,685
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 8 | 29
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (132) | (46)
Debt Securities Held-to-Maturity, Fair Value |  | 4,041 | 4,668
Equity Securities, at Fair Value, Amortized Cost |  | 181 | 169
Equity Securities, at Fair Value, Fair Value |  | 181 | 169
Other equity securities, Amortized Cost |  | 7 | 7
Other equity securities, Fair Value |  | 7 | 7
Total equity securities, at cost, Amortized Cost |  | 834 | 722
Total equity securities, at cost, Fair Value |  | 834 | 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 |  | 24 | 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: |  | 24 | 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: |  | 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 |  | 20,211 | 20,065
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 28 | 40
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (605) | (277)
Debt securities available for sale: |  | 19,634 | 19,828
Debt Securities Held-to-Maturity, Amortized Cost |  | 3,425 | 3,853
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 0 | 7
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (132) | (46)
Debt Securities Held-to-Maturity, Fair Value |  | 3,293 | 3,814
Other/non-agency |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 236 | 311
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 3 | 7
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (7) | (7)
Debt securities available for sale: |  | 232 | 311
Debt Securities Held-to-Maturity, Amortized Cost |  | 740 | 832
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 8 | 22
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | 0 | 0
Debt Securities Held-to-Maturity, Fair Value |  | 748 | 854
Total mortgage-backed securities |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Debt Securities Available-for-Sale, Amortized Cost |  | 20,447 | 20,376
Debt Securities Available-for-Sale, Gross Unrealized Gains |  | 31 | 47
Debt Securities Available-for-Sale, Gross Unrealized Losses |  | (612) | (284)
Debt securities available for sale: |  | 19,866 | 20,139
Debt Securities Held-to-Maturity, Amortized Cost |  | 4,165 | 4,685
Debt Securities Held-to-Maturity, Gross Unrealized Gain |  | 8 | 29
Debt Securities Held-to-Maturity, Gross Unrealized Losses |  | (132) | (46)
Debt Securities Held-to-Maturity, Fair Value |  | 4,041 | 4,668
Money market mutual fund investments |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Equity Securities, at Fair Value, Amortized Cost |  | 181 | 165
Equity Securities, at Fair Value, Fair Value |  | 181 | 165
Other investments |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |
Equity Securities, at Fair Value, Amortized Cost |  | 0 | 4
Equity Securities, at Fair Value, 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, 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 |  | 364 | 252
Federal Home Loan Bank stock, Fair Value |  | $ 364 | $ 252
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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