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Summary of Significant Accounting Policies and Other Matters - Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue from External Customer [Line Items] |  |  |
Excise taxes | $ 400 | $ 358 | $ 323
CECONY |  |  |
Revenue from External Customer [Line Items] |  |  |
Excise taxes | $ 387 | $ 346 | $ 312

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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 https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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