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SHARE CAPITAL - COMMON SHARES (Details) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Nov. 08, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Shares        
Balance at beginning of period (in shares)   2,022    
Balance at end of period (in shares)   2,025 2,022  
Common Shares        
Common Shares        
Balance at beginning of period (in shares)   2,022 1,695 943
Balance at beginning of period, Amount   $ 64,677 $ 50,737 $ 10,492
Common shares issued (in shares)   0 0 33
Common shares issued, Amount   $ 0 $ 0 $ 1,500
Common shares issued in acquisition, amount   $ 0 $ 12,727 $ 0
Dividend Reinvestment and Share Purchase Plan (in shares)   0 28 25
Dividend Reinvestment and Share Purchase Plan   $ 0 $ 1,181 $ 1,226
Shares issued on exercise of stock options (in shares)   3 2 3
Shares issued on exercise of stock options, Amount   $ 69 $ 32 $ 90
Balance at end of period (in shares)   2,025 2,022 1,695
Balance at end of period, Amount   $ 64,746 $ 64,677 $ 50,737
Merger Transaction | Common Shares        
Common Shares        
Common shares issued in acquisition (in shares)   0 0 691
Common shares issued in acquisition, amount   $ 0 $ 0 $ 37,429
Spectra Energy Partners, LP | Common Shares        
Common Shares        
Common shares issued in acquisition (in shares)   0 91 0
Common shares issued in acquisition, amount   $ 0 $ 3,888 $ 0
Enbridge Energy Partners, L.P. | Common Shares        
Common Shares        
Common shares issued in acquisition (in shares)   0 72 0
Common shares issued in acquisition, amount   $ 0 $ 3,042 $ 0
Enbridge Energy Management, L.L.C. (EEM) | Common Shares        
Common Shares        
Common shares issued in acquisition (in shares)   0 30 0
Common shares issued in acquisition, amount   $ 0 $ 1,267 $ 0
Enbridge Income Fund | Common Shares        
Common Shares        
Common shares issued in acquisition (in shares)   0 104 0
Common shares issued in acquisition, amount $ 4,500 $ 0 $ 4,530 $ 0