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ORGANIZATION AND BASIS OF PRESENTATION - Accounts Receivable (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Feb. 29, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Deferred for recovery   $ 12 $ 103 $ 25
Customer Receivables        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance   164 46 50
Charged to income   54 174 81
Charged to other accounts   42 46 47
Write-offs   (101) (102) (132)
Ending balance   159 164 46
Other Receivables        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance   26 21 2
Charged to income   3 7 27
Charged to other accounts   3 10 1
Write-offs   (22) (12) (9)
Ending balance   10 26 21
Affiliated companies        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance   0 1,063 920
Charged to income   0 0 143
Charged to other accounts   0 0 0
Write-offs   0 (1,063) 0
Ending balance   $ 0 $ 0 $ 1,063
Affiliated companies | FES        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Write-offs $ (1,100)