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Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 01, 2016
Apr. 01, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Variable Interest Entity [Line Items]          
Proceeds from Noncontrolling Interests     $ 437 $ 164  
Sabal Trail Transmission, LLC          
Variable Interest Entity [Line Items]          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     37.90%    
Nexus Transmission, LLC          
Variable Interest Entity [Line Items]          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     37.90%    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount     $ 1,000    
Nexus Transmission, LLC | Investments in and loans to unconsolidated affiliates          
Variable Interest Entity [Line Items]          
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets     $ 281   $ 90
Scenario, Forecast | Sabal Trail Transmission, LLC          
Variable Interest Entity [Line Items]          
Construction and Development Costs $ 1,500        
Spectra Energy Partners, LP | Sabal Trail Transmission, LLC          
Variable Interest Entity [Line Items]          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     50.00%    
NextEra | Spectra Energy Partners, LP | Sabal Trail Transmission, LLC          
Variable Interest Entity [Line Items]          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Sale of Interest by Parent   9.50%      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale of Interest by Parent   $ 110      
Proceeds from Noncontrolling Interests   $ 102