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FAIR VALUE MEASUREMENTS (Level 3 Measurements and Sensitivity Analysis) (Details) $ in Millions | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | $ 1,497 | $ 370
Market approach | Congestion revenue rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 305 | 188
Liabilities | $ | 138 | 93
Discounted cash flow | Power purchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 127 | 26
Liabilities | $ | $ 95 | $ 155
CRR auction prices | Market approach | Congestion revenue rights | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | (145.09) | (40.77)
CRR auction prices | Market approach | Congestion revenue rights | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | 2,724.93 | 2,265.94
CRR auction prices | Market approach | Congestion revenue rights | Weighted average price |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | 0.89 | 0.40
Forward prices | Discounted cash flow | Power purchase agreements | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | (6.39) | (7.97)
Forward prices | Discounted cash flow | Power purchase agreements | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | 286.75 | 256.20
Forward prices | Discounted cash flow | Power purchase agreements | Weighted average price |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | 78.14 | 47.17

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