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Other Postretirement Benefits - Additional Information (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase in liability for other postretirement benefits | $ 102 |  |
Increase (decrease) in regulatory liabilities | 134 |  |
Net losses unrecognized to be amortized | 27 |  |
Prior service cost estimated to be amortized | $ (3) |  |
Health care cost trend rate for net periodic benefit cost, current | 5.40% | 5.60% | 5.80%
Health care cost trend rate for net periodic benefit cost | 4.50% |  |
Health care cost trend rate for benefit obligations, current | 5.20% | 5.40% | 5.60%
Health care cost trend rate for benefit obligations | 4.50% |  |
Expected contributions | $ 6 |  |
Clean Energy Businesses, Con Edison Transmission and RECO |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Credit to OCI (net of taxes) for unrecognized net losses | 6 |  |
Debit to OCI (net of taxes) for unrecognized prior service costs | 1 |  |
CECONY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase in liability for other postretirement benefits | 128 |  |
Increase (decrease) in regulatory liabilities | 153 |  |
Net losses unrecognized to be amortized | 22 |  |
Prior service cost estimated to be amortized | $ (2) |  |

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