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FAIR VALUE MEASUREMENTS (Level 3 Measurements and Sensitivity Analysis) (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) $ / MWh | Dec. 31, 2018 USD ($) $ / MWh
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 7,477 | $ 5,350
Liabilities | $ 85 | $ 109
Congestion revenue rights | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | (13.11) | (18.61)
Congestion revenue rights | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | 22.76 | 32.26
Power purchase agreements | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | 19.68 | 19.81
Power purchase agreements | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | 38.80 | 38.80
Market approach | Congestion revenue rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 191 | $ 203
Liabilities | 64 | 75
Discounted cash flow | Power purchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 1 | 0
Liabilities | $ 19 | $ 33

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