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Acquisitions - Additional Information (Details)
CAD in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2015
USD ($)
MW
May. 12, 2015
USD ($)
MW
Apr. 30, 2015
equity_investment
MW
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Oct. 01, 2015
CAD
MW
Jul. 31, 2015
Business Acquisition [Line Items]              
Percentage of economic rights     100.00%        
NET Midstream [Member]              
Business Acquisition [Line Items]              
Ownership interests percentage             100.00%
Acquisition-related costs       $ 5 $ 5    
Subsidiaries [Member] | Adelanto I, Adelanto II and McCoy [Member]              
Business Acquisition [Line Items]              
Number of equity method investments | equity_investment     3        
Renewable energy assets, power capacity (megawatts) | MW     277        
Renewable energy assets, power capacity put into service (megawatts) | MW     95        
Subsidiaries [Member] | Ashtabula III, Baldwin, Mammoth Plains and Stateline [Member]              
Business Acquisition [Line Items]              
Renewable energy assets, power capacity (megawatts) | MW   664          
Consideration transferred   $ 424          
Liabilities assumed in consideration transfer   $ 269          
NextEra Energy Operating Partners, LP [Member]              
Business Acquisition [Line Items]              
Ownership interests percentage     50.00%        
NextEra Energy Partners, LP [Member] | Class B Units, Series 1 [Member] | NextEra Energy Operating Partners, LP [Member]              
Business Acquisition [Line Items]              
Number of units issued | shares     1,000,000        
NextEra Energy Partners, LP [Member] | Class B Units, Series 2 [Member] | NextEra Energy Operating Partners, LP [Member]              
Business Acquisition [Line Items]              
Number of units issued | shares     1,000,000        
Subsequent Event [Member] | Ontario, Canada [Member]              
Business Acquisition [Line Items]              
Working capital part of consideration transferred $ 19            
Subsequent Event [Member] | Subsidiaries [Member] | NET Midstream [Member]              
Business Acquisition [Line Items]              
Consideration transferred 2,000            
Cash consideration 934            
Liabilities assumed in consideration transfer 654            
Contingent consideratio, additional capital expenditures 100            
Consideration transferred after completion of contingent consideration $ 2,100            
Subsequent Event [Member] | Subsidiaries [Member] | Ontario, Canada [Member] | Wind Generating Facility from NEER [Member]              
Business Acquisition [Line Items]              
Renewable energy assets, power capacity (megawatts) | MW 149         149  
Consideration transferred $ 210            
Liabilities assumed in consideration transfer $ 294            
Receivable acquired in consideration transfer | CAD           CAD 43  
Annual interest rate percentage for receivable 7.10%         7.10%  
Holdback Payable [Member] | Subsequent Event [Member] | Subsidiaries [Member] | NET Midstream [Member]              
Business Acquisition [Line Items]              
Indemnity holdback payable $ 200            
Indemnity Holdback [Member] | Subsequent Event [Member] | Subsidiaries [Member] | NET Midstream [Member]              
Business Acquisition [Line Items]              
Indemnity holdback payable 200            
Reduction in holdback payable $ 10