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FAIR VALUE MEASUREMENTS (Level 3 Measurements and Sensitivity Analysis) (Details) $ in Millions | Mar. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | $ 285 | $ 370
Market approach | Congestion revenue rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 180 | 188
Liabilities | $ | 95 | 93
Discounted cash flow | Power purchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 29 | 26
Liabilities | $ | $ 138 | $ 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) | (2,265.69) | (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) | 2,265.94 | 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) | 0.41 | 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) | (6.75) | (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) | 247.15 | 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) | 50.98 | 47.17

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