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FAIR VALUE MEASUREMENTS (Level 3 Measurements and Sensitivity Analysis) (Details)
$ in Millions
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets | $ $ 403 $ 456
Market approach | Congestion revenue rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets | $ 366 357
Liabilities | $ 121 134
Discounted cash flow | Power purchase agreements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets | $ 17 47
Liabilities | $ $ 127 $ 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) (951) (924)
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) 50,044 16,697
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) 2 1
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 1
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) 126 190
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) 47 60