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FAIR VALUE MEASUREMENTS (Level 3 Measurements and Sensitivity Analysis) (Details) $ in Millions | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | $ 456 | $ 1,497
Market approach | Congested Revenue Rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 357 | 305
Liabilities | $ | 134 | 138
Discounted cash flow | Power purchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 47 | 127
Liabilities | $ | $ 79 | $ 95
CRR auction prices | Market approach | Congested Revenue Rights | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | (923.72) | (145.09)
CRR auction prices | Market approach | Congested Revenue Rights | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | 16,696.9 | 2,724.93
CRR auction prices | Market approach | Congested Revenue Rights | Weighted average price |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range (in dollars per mwh) | 1.43 | 0.89
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) | 0.86 | (6.39)
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) | 189.80 | 286.75
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) | 60.03 | 78.14

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