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FAIR VALUE MEASUREMENTS (Level 3 Measurements and Sensitivity Analysis) (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) $ / MWh | Dec. 31, 2020 USD ($) $ / MWh
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | $ 5,510 | $ 5,315
Liabilities | $ | 237 | 217
Market approach | Congestion revenue rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | 135 | 153
Liabilities | $ | $ 75 | $ 74
Market approach | Congestion revenue rights | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | (320.25) | (320.25)
Market approach | Congestion revenue rights | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | 320.25 | 320.25
Market approach | Congestion revenue rights | Weighted Average Price |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | 0.25 | 0.30
Discounted cash flow | Power purchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ | $ 28 | $ 13
Liabilities | $ | $ 168 | $ 164
Discounted cash flow | Power purchase agreements | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | (8.16) | 12.56
Discounted cash flow | Power purchase agreements | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | 232.15 | 148.30
Discounted cash flow | Power purchase agreements | Weighted Average Price |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable input (dollars per mwh) | $ / MWh | 49.17 | 35.52

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