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FAIR VALUE MEASUREMENTS (Level 3 Measurements and Sensitivity Analysis) (Details) $ in Millions | Jun. 30, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | $ 409 | $ 456
Market approach | Congestion revenue rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 327 | 357
Liabilities | $ | 117 | 134
Discounted cash flow | Power purchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 24 | 47
Liabilities | $ | $ 76 | $ 79
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) | (17,980.6) | (923.72)
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) | 17,974.2 | 16,696.9
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) | 1.57 | 1.43
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) | 0.27 | 0.86
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) | 140.45 | 189.80
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) | 54.93 | 60.03

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