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Summary of Significant Accounting Policies and Other Matters - Schedule of Total Excise Taxes Recorded in Operating Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Excise Taxes [Line Items] |  |  |
Excise taxes | $ 323 | $ 330 | $ 302
CECONY |  |  |
Schedule of Excise Taxes [Line Items] |  |  |
Excise taxes | $ 312 | $ 318 | $ 292

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- Definition Schedule of Excise Taxes [Line Items] + References No definition available. + Details
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- Definition The excise taxes collected by a public utility and reported in revenues if the amount of excise taxes is equal to 1 percent or more of such total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)(e)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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