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Summary of Significant Accounting Policies and Other Matters - Investments (Details) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) mi | Dec. 31, 2020 USD ($) | Dec. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | May 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 30, 2020 USD ($) | Jan. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Supplemental retirement income plan assets | $ 525.0 | $ 465.0 |  |  |  |  |  |
Deferred income plan assets | 102.0 | 92.0 |  |  |  |  |  |
Other | 3.0 | 3.0 |  |  |  |  |  |
Total investments | 853.0 | 1,816.0 |  |  |  |  |  |
Stagecoach |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Loss on sale of investment (pre-tax) | 212.0 |  |  |  |  |  |  |
Loss on sale of investment | 147.0 |  |  |  |  |  |  |
Equity method investments |  |  |  | $ 630.0 |  | $ 667.0 |  |
Mountain Valley Pipeline |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments | 530.0 | 530.0 |  |  |  |  |  |
CET | Stagecoach |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments | 0.0 | 845.0 |  |  |  |  |  |
CET | Mountain Valley Pipeline |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments | 111.0 | 342.0 |  |  |  |  |  |
CET | New York Transco, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments | 112.0 | 69.0 |  |  |  |  |  |
CET | Stagecoach | Subsidiaries |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale | $ 1,225.0 |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |  |  |  |
Impairment loss | $ 414.0 |  |  |  |  |  |  |
CET Gas | Stagecoach | Subsidiaries |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale | 629.0 |  |  |  |  |  |  |
CECONY |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Supplemental retirement income plan assets | 499.0 | 439.0 |  |  |  |  |  |
Deferred income plan assets | 102.0 | 92.0 |  |  |  |  |  |
Other | 7.0 | 10.0 |  |  |  |  |  |
Total investments | 608.0 | 541.0 |  |  |  |  |  |
CECONY | CET | Stagecoach |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments | 0.0 | 0.0 |  |  |  |  |  |
CECONY | CET | Mountain Valley Pipeline |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments | 0.0 | 0.0 |  |  |  |  |  |
CECONY | CET | New York Transco, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments | $ 0.0 | $ 0.0 |  |  |  |  |  |
CET Gas | Mountain Valley Pipeline |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 10.20% | 11.30% |  |  |  |  |  |
Impairment loss | $ 231.0 | $ 320.0 |  |  |  |  |  |
Equity method investments |  | 530.0 |  |  |  |  |  |
Number of miles in pipeline construction | mi | 300 |  |  |  |  |  |  |
Carrying value of investment | $ 111.0 | $ 342.0 | $ 342.0 |  |  |  | $ 662.0 |
Expected reduction in equity interest | 8.50% |  |  |  |  |  |  |
Project, percent completion | 92.00% | 94.00% |  |  |  |  |  |
Long -term firm transportation contract period | 20 years |  |  |  |  |  |  |
Cash flows discount rate | 8.30% |  |  |  |  |  |  |
Deferred tax assets | $ 130.0 | $ 53.0 |  |  |  |  |  |
Increase in deferred tax assets | 77.0 |  |  |  |  |  |  |
Impairment loss, after tax | $ 162.0 | $ 223.0 |  |  |  |  |  |
Aggregate project cost |  |  |  |  | $ 6,200.0 |  |  |
CET Gas | Mountain Valley Pipeline | Mountain Valley Pipeline |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 12.50%
CET Electric | New York Transco, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 45.70% |  |  |  |  |  |  |

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