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Electricity Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]  
2017 $ 178
2018 125
2019 120
2020 76
2021 54
All Years Thereafter 710
CECONY  
Long-term Contract for Purchase of Electric Power [Line Items]  
2017 178
2018 125
2019 119
2020 75
2021 54
All Years Thereafter $ 710