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Pension Benefits - Additional Information (Details) - Pension Benefits $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions | $ 467
Contributions | 465
CECONY | Subsidiaries |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions | 429
Contributions | 428
CECONY | Nonqualified Plan | Subsidiaries |
Defined Benefit Plan Disclosure [Line Items] |
Contributions | $ 22

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