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SHARE CAPITAL - COMMON SHARES (Details) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Shares      
Balance at beginning of period (in shares) 2,025    
Balance at end of period (in shares) 2,026 2,025  
Common Shares      
Common Shares      
Balance at beginning of period (in shares) 2,025 2,022 1,695
Balance at beginning of period, Amount $ 64,746 $ 64,677 $ 50,737
Common shares issued in acquisition (in shares) 0 0 297
Common shares issued in acquisition, amount $ 0 $ 0 $ 12,727
Dividend Reinvestment and Share Purchase Plan (in shares) 0 0 28
Dividend Reinvestment and Share Purchase Plan $ 0 $ 0 $ 1,181
Shares issued on exercise of stock options (in shares) 1 3 2
Shares issued on exercise of stock options, Amount $ 22 $ 69 $ 32
Balance at end of period (in shares) 2,026 2,025 2,022
Balance at end of period, Amount $ 64,768 $ 64,746 $ 64,677