FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Derivative Volumes) (Details) BTU in Billions |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2023
BTU
GWh
|
Dec. 31, 2022
GWh
BTU
|
|
| Power Contracts GWh | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, energy measure | GWh | 1,449 | 1,979 |
| Gas Contracts BBtu | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, energy measure | BTU | 89,105 | 96,755 |