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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

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