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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance For Uncollectible Accounts - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 68 | $ 70 | $ 83
Charged To Costs And Expenses | 77 | 62 | 64
Charged To Other Accounts | 0 | 0 | 0
Deductions | (71) | (64) | (77)
Balance At End of Period | 74 | 68 | 70
CECONY |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 61 | 65 | 78
Charged To Costs And Expenses | 72 | 56 | 60
Charged To Other Accounts | 0 | 0 | 0
Deductions | (65) | (60) | (73)
Balance At End of Period | $ 68 | $ 61 | $ 65

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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