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SHARE CAPITAL - Common Shares (Details) - CAD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Common Shares |  |  |
Balance at beginning of period (in shares) | 2,026 |  |
Share purchases at stated value (in shares) | (3) | 0 | 0
Share purchases at stated value | $ (88) | $ 0 | $ 0
Other | $ (4) | $ 0 | $ 0
Other ( in shares) | 0 | 0 | 0
Balance at end of period (in shares) | 2,025 | 2,026 |
Common Shares |  |  |
Common Shares |  |  |
Balance at beginning of period (in shares) | 2,026 | 2,026 | 2,025
Balance at beginning of period, Amount | $ 64,799 | $ 64,768 | $ 64,746
Shares issued on exercise of stock options (in shares) | 2 | 0 | 1
Shares issued on exercise of stock options | $ 53 | $ 31 | $ 22
Share purchases at stated value | $ (88) | $ 0 | $ 0
Balance at end of period (in shares) | 2,025 | 2,026 | 2,026
Balance at end of period, Amount | $ 64,760 | $ 64,799 | $ 64,768

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