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ORGANIZATION AND BASIS OF PRESENTATION - Accounts Receivable (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Deferred for recovery |  | $ 103 | $ 25 | $ 24
Customer Receivables |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 46 | 50 | 49
Charged to income |  | 174 | 81 | 77
Charged to other accounts |  | 46 | 47 | 60
Write-offs |  | (102) | (132) | (136)
Ending balance |  | 164 | 46 | 50
Other Receivables |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 21 | 2 | 1
Charged to income |  | 7 | 27 | 13
Charged to other accounts |  | 10 | 1 | 0
Write-offs |  | (12) | (9) | (12)
Ending balance |  | 26 | 21 | 2
Affiliated companies |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 1,063 | 920 | 0
Charged to income |  | 0 | 143 | 920
Charged to other accounts |  | 0 | 0 | 0
Write-offs |  | (1,063) | 0 | 0
Ending balance |  | $ 0 | $ 1,063 | $ 920
Affiliated companies | FES |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Write-offs | $ (1,100) |  |  |

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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