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DERIVATIVES (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
Aggregate notional amount of interest rate swaps | $ 825,000,000 | $ 825,000,000
Face value of medium-term notes | 16,000,000 | $ 7,000,000
Fair Value Hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount of interest rate swaps | 825,000,000 |
Cash Flow Hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount of interest rate swaps | $ 15,000,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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