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OTHER CONTINGENCIES AND COMMITMENTS (Nuclear Insurance and Purchase Commitments) (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
nuclear_generating_unit
Long-term Purchase Commitment [Line Items]  
Number of nuclear generating units (nuclear generating unit) | nuclear_generating_unit 2
Maximum total payment incurred per event under the loss sharing program $ 450,000,000
Nuclear Electric Insurance Limited and European Mutual Association for Nuclear Insurance  
Long-term Purchase Commitment [Line Items]  
Insurance coverage, loss 400,000,000
Humboldt Bay Unit  
Long-term Purchase Commitment [Line Items]  
Amount of property damage coverage provided by NEIL 50,000,000
Amount of liability insurance for Humboldt Bay Unit 3 53,000,000
Diablo Canyon  
Long-term Purchase Commitment [Line Items]  
Maximum public liability per nuclear incident under Price-Anderson Act 16,300,000,000
Maximum available public liability insurance for Diablo Canyon as required by Price-Anderson Act 450,000,000
Maximum annual payment incurred per event under the loss sharing program 332,000,000
Maximum annual payment incurred per event under the loss sharing program $ 49,000,000
Period for inflation adjustment 5 years
Nuclear Incident  
Long-term Purchase Commitment [Line Items]  
Amount of property damage and business interruption coverage provided by NEIL for Diablo Canyon $ 3,200,000,000
Nuclear Incident | Humboldt Bay Unit  
Long-term Purchase Commitment [Line Items]  
Amount of indemnification from the nuclear regulatory commission for public liability arising from nuclear incidents 450,000,000
Non-Nuclear Incident  
Long-term Purchase Commitment [Line Items]  
Amount of property damage and business interruption coverage provided by NEIL for Diablo Canyon 2,500,000,000
European Mutual Association for Nuclear Insurance  
Long-term Purchase Commitment [Line Items]  
Full insurance policy limit 200,000,000
Potential premium obligation 4,000,000
Nuclear Electric Insurance Limited  
Long-term Purchase Commitment [Line Items]  
Potential premium obligation $ 41,000,000