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General - Business Combination (Details) - Enbridge-Spectra Proposed Merger - USD ($)
$ / shares in Units, $ in Billions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Sep. 02, 2016
Business Acquisition [Line Items]      
Business Acquisition, Share Price Premium     11.50%
Scenario, Forecast      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 43.00%    
Enbridge, Inc | Spectra Energy Corp      
Business Acquisition [Line Items]      
Business Acquisition, Date of Acquisition Agreement   Sep. 02, 2016  
Business Acquisition, Shares Conversion Ratio     0.984
Business Acquisition, Share Price     $ 40.33
Enbridge, Inc | Scenario, Forecast      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 57.00%    
Enbridge, Inc | Scenario, Forecast | Spectra Energy Corp      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred $ 28