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Leases - Future Minimum Lease Commitments (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Capital Leased Assets [Line Items]  
2017 $ 1
2018 1
2019 0
2020 0
2021 0
All years thereafter 0
Total 2
Less: amount representing interest 0
Present value of net minimum lease payment 2
CECONY  
Capital Leased Assets [Line Items]  
2017 1
2018 1
2019 0
2020 0
2021 0
All years thereafter 0
Total 2
Less: amount representing interest 0
Present value of net minimum lease payment $ 2