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Variable Interest Entities - Additional Information (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
USD ($)
VIE
Dec. 31, 2015
USD ($)
MW
Variable Interest Entity [Line Items]      
Noncontrolling interest   $ 8 $ 9
Variable Interest Entity, Primary Beneficiary | Texas Solar 4      
Variable Interest Entity [Line Items]      
Percentage of variable interests 80.00% 80.00%  
VIE consolidated, carrying amount, assets and liabilities, net   $ 54 58
Noncontrolling Interest      
Variable Interest Entity [Line Items]      
Noncontrolling interest   $ 7 $ 9
Texas | Variable Interest Entity, Primary Beneficiary | Texas Solar 4      
Variable Interest Entity [Line Items]      
Generating capacity (MW AC) | MW     40
CECONY      
Variable Interest Entity [Line Items]      
Number of potential VIEs, long-term electricity purchase agreements | VIE   2