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Dispositions - Narrative (Details) $ in Millions |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2023 USD ($) solarProject project | Dec. 31, 2023 USD ($) MWh project | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 01, 2022 USD ($) | Jun. 30, 2021 USD ($) | May 31, 2021 | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of projects sold |  | $ 49,594 | $ 46,752 |  |  |  |  |  |
Gain (loss) on disposition of stock in subsidiary | $ 865 |  |  |  |  |  |  |  |
Gain (loss) on disposition of stock in subsidiary, after tax | $ 767 |  |  |  |  |  |  |  |
Period to obtain counter party consent (in years) |  | 2 years |  |  |  |  |  |  |
Number of solar projects | 2 | 2 |  |  |  |  |  |  |
Unbilled contracts receivable |  | $ 4 | 80 | $ 35 |  |  |  |  | $ 11
Electric Energy |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | MWh |  | 34,892,535 |  |  |  |  |  |  |
Clean Energy Businesses | Renewables Americas, LLC |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Estimate of possible loss |  | $ 24 |  |  |  |  |  |  |
Unbilled contracts receivable |  | 4 |  |  |  |  |  |  |
Clean Energy Businesses | Renewables Americas, LLC | Maximum |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Estimate of possible loss |  | 172 |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Consideration the project is sold | $ 3,993 |  |  |  | $ 6,800 |  |  |  |
Gain (loss) on disposition of stock in subsidiary |  | 865 |  |  |  |  |  |  |
Gain (loss) on disposition of stock in subsidiary, after tax |  | $ 767 |  |  |  |  |  |  |
Number of tax equity projects | project | 2 | 3 |  |  |  |  |  |  |
Disposal group, including discontinue operation, transaction costs |  | $ 12 | 48 |  |  |  |  |  |
Disposal group, including discontinue operation, transaction costs, after tax |  | 9 | $ 35 |  |  |  |  |  |
Depreciation and amortization, before tax |  | 41 |  |  |  |  |  |  |
Depreciation and amortization, after tax |  | $ 28 |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Crane Project |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Holding period (in years) |  | 5 years |  |  |  |  |  |  |
Carrying value of tax equity interest |  | $ 13 |  |  |  |  |  |  |
Stagecoach |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment |  |  |  |  |  | $ 630 |  | $ 667 |
Clean Energy Businesses | Broken Bow II | Electric Energy |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of deferred projects | project | 1 | 1 |  |  |  |  |  |  |
Notional amount | MWh |  | 75 |  |  |  |  |  |  |
Clean Energy Businesses | Subsidiaries |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of projects sold |  |  |  |  |  | $ 192 |  |  |
Gain (loss) on sale of projects |  |  |  | 3 |  |  |  |  |
Gain on sale, after tax |  |  |  | 2 |  |  |  |  |
Equity method investment |  |  |  | 11 |  |  |  |  |
Con Edison Transmission | Subsidiaries | Stagecoach |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 1,225 |  |  |  |  |
Percentage of equity interest acquired (in percent) |  |  | 50.00% |  |  |  | 50.00% |  |
CECONY |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of projects sold |  | $ 46,646 | $ 44,009 |  |  |  |  |  |
CECONY | Electric Energy |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | MWh |  | 32,315,225 |  |  |  |  |  |  |
CECONY | Stagecoach | Purchased Power Costs | Equity Method Investee |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired (in percent) |  |  |  | 50.00% |  |  |  |  |

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