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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Schedule of Guarantor Obligations (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Guarantor Obligations [Line Items]  
Potential additional collateral obligations $ 380
Percent of face amount of debt 100.00%
Curing period 30 days
Utilities and Transmission Companies  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations $ 131
FE  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations 249
Upon Further Downgrade  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations 70
Upon Further Downgrade | Utilities and Transmission Companies  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations 70
Upon Further Downgrade | FE  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations 0
Surety Bond  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations $ 310
Percent of face amount of debt 60.00%
Capped portion of surety bond obligations $ 39
Surety Bond | Utilities and Transmission Companies  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations 61
Surety Bond | FE  
Guarantor Obligations [Line Items]  
Potential additional collateral obligations $ 249