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COMMON SHARES - Reconciliation and Weighted Average Common Shares Outstanding (Details) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (decrease) in equity      
Outstanding at the beginning of the period (in shares) 918,000    
Outstanding at the beginning of the period $ 23,174    
Exercise of options (in shares) 5,138    
Outstanding at the end of the period (in shares) 938,000 918,000  
Outstanding at the end of the period $ 24,387 $ 23,174  
Weighted Average Common Shares Outstanding      
Basic (in shares) 929,000 902,000 872,000
Diluted (in shares) 931,000 903,000 874,000
Common Shares      
Increase (decrease) in equity      
Outstanding at the beginning of the period (in shares) 918,097 881,376 863,759
Outstanding at the beginning of the period $ 23,174 $ 21,167 $ 20,099
Dividend reinvestment and share purchase plan (in shares) 15,165 15,937 12,824
Dividend reinvestment and share purchase plan $ 931 $ 855 $ 790
At-the-market equity issuance program (in shares)   20,050 3,462
At-the-market equity issuance program   $ 1,118 $ 216
Exercise of options (in shares) 5,138 734 1,331
Exercise of options $ 282 $ 34 $ 62
Outstanding at the end of the period (in shares) 938,400 918,097 881,376
Outstanding at the end of the period $ 24,387 $ 23,174 $ 21,167
Weighted Average Common Shares Outstanding      
Basic (in shares) 929,000 902,000 872,000
Diluted (in shares) 931,000 903,000 874,000