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Variable Interest Entities - Additional Information (Detail)
1 Months Ended 12 Months Ended
May. 31, 2014
MW
Dec. 31, 2015
USD ($)
VIE
MW
Dec. 31, 2014
USD ($)
MW
Dec. 31, 2013
USD ($)
Variable Interest Entity [Line Items]        
Investments   $ 884,000,000 $ 816,000,000  
Proceeds from sale of solar electric production projects   0 108,000,000 $ 0
Gain on sale of solar electric production projects   0 45,000,000 $ 0
Noncontrolling interest   9,000,000 $ 9,000,000  
Variable Interest Entity, Not Primary Beneficiary | California Solar        
Variable Interest Entity [Line Items]        
Percentage of variable interests 50.00%      
Generating Capacity (MW AC) | MW 110      
Variable Interest Entity, Primary Beneficiary | Texas Solar 4        
Variable Interest Entity [Line Items]        
Percentage of variable interests     80.00%  
Payments to acquire businesses     $ 49,000,000  
VIE consolidated, carrying amount, assets and liabilities, net   $ 58,000,000 58,000,000  
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure        
Variable Interest Entity [Line Items]        
Percentage of variable interests   50.00%    
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure | Panoche Valley        
Variable Interest Entity [Line Items]        
Percentage of variable interests   50.00%    
Investments   $ 37,000,000    
Notes receivable, related parties   $ 77,000,000    
CECONY        
Variable Interest Entity [Line Items]        
Number of potential VIEs, long-term electricity purchase agreements | VIE   2    
Investments   $ 286,000,000 $ 271,000,000  
California Solar        
Variable Interest Entity [Line Items]        
Percentage of membership interests sold 50.00%      
Proceeds from sale of solar electric production projects   108,000,000    
Gain on sale of solar electric production projects   45,000,000    
Gain (loss) on investments, net of tax   $ 26,000,000    
California | Variable Interest Entity, Not Primary Beneficiary | Panoche Valley        
Variable Interest Entity [Line Items]        
Generating Capacity (MW AC) | MW   247    
Texas | Variable Interest Entity, Primary Beneficiary | Texas Solar 4        
Variable Interest Entity [Line Items]        
Generating Capacity (MW AC) | MW     40  
Noncontrolling Interest        
Variable Interest Entity [Line Items]        
Noncontrolling interest   $ 9,000,000 $ 9,000,000