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Pension Benefits - Additional Information (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 USD ($)
CECONY |
Defined Benefit Plan Disclosure [Line Items] |
Contributions | $ 78
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions | 474
Contributions | 79
Pension Benefits | CECONY |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions | 434
Contributions | $ 18

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