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Variable Interest Entities - Summary of VIEs (Details) - Variable Interest Entity, Not Primary Beneficiary $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) MW
Great Valley Solar |
Variable Interest Entity [Line Items] |
Generating Capacity Owned (MW AC) | MW | 200
Maximum Exposure to Loss | $ | $ 228
Great Valley Solar | Minimum |
Variable Interest Entity [Line Items] |
Power Purchase Agreement Term in Years | 15 years
Great Valley Solar | Maximum |
Variable Interest Entity [Line Items] |
Power Purchase Agreement Term in Years | 20 years
Copper Mountain Solar - Mesquite Solar |
Variable Interest Entity [Line Items] |
Generating Capacity Owned (MW AC) | MW | 344
Maximum Exposure to Loss | $ | $ 417
Copper Mountain Solar - Mesquite Solar | Minimum |
Variable Interest Entity [Line Items] |
Power Purchase Agreement Term in Years | 20 years
Copper Mountain Solar - Mesquite Solar | Maximum |
Variable Interest Entity [Line Items] |
Power Purchase Agreement Term in Years | 25 years

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- Definition Generating capacity of plant owned thru equity method investment in entity. + References No definition available. + Details
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Namespace Prefix: | ed_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with 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 (c) -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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