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Variable Interest Entities - Additional Information (Details) - Clean Energy Businesses - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Con Edison Development | CED Nevada Virginia |  |
Variable Interest Entity [Line Items] |  |
Income before tax | $ 39 |
Income after tax | 30 |
Variable Interest Entity, Primary Beneficiary | Tax Equity Projects |  |
Variable Interest Entity [Line Items] |  |
Income (loss) before tax | 10 |
Net income (loss) | 7 |
Variable Interest Entity, Primary Beneficiary | Tax Equity Investors | Tax Equity Projects |  |
Variable Interest Entity [Line Items] |  |
Income (loss) before tax | 5 | $ 2
Net income (loss) |  | 1
Measure of activity, loss, after tax | 4 |
Variable Interest Entity, Primary Beneficiary | Tax Equity Investors | CED Nevada Virginia |  |
Variable Interest Entity [Line Items] |  |
Income (loss) before tax | (42) |
Net income (loss) | $ (32) |
Variable Interest Entity, Primary Beneficiary | Con Edison Development | Tax Equity Projects |  |
Variable Interest Entity [Line Items] |  |
Income (loss) before tax |  | (3)
Net income (loss) |  | $ (2)
Percentage of variable interests (less than) | 100.00% |

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- Definition Income (Loss) From Equity Method Investments, Hypothetical Liquidation At Book Value, Before Tax + References No definition available. + Details
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- Definition Income (Loss) From Equity Method Investments, Hypothetical Liquidation At Book Value, Net + References No definition available. + Details
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- Definition Variable Interest Entity, Measure Of Activity, Income Or Loss After Tax + References No definition available. + Details
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- Definition Variable Interest Entity, Measure Of Activity, Net Income (Loss) + References No definition available. + Details
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- Definition Description of the amount of pre-tax income (loss) derived by the reporting entity from the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5747-111685 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123419778&loc=SL6759159-111685 + Details
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- Details
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