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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

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