REVENUE - Activity in Uncollectable Accounts (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Deferred for recovery		$ 11	$ 12	$ 103
Increase (decrease) in allowance for credit loss,	$ (25)			121
Customer Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	159	159	164	46
Charged to income		59	54	174
Charged to other accounts		62	42	46
Write-offs		(143)	(101)	(102)
Ending balance		137	159	164
Other Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10	10	26	21
Charged to income		4	3	7
Charged to other accounts		4	3	10
Write-offs		(7)	(22)	(12)
Ending balance		11	10	26
Affiliated Companies Receivables | FES
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 0	0	0
Write-offs				(1,100)
Ending balance		$ 0	$ 0	$ 0