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EARNINGS PER SHARE (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Earnings per share [abstract] |  |
Numerator (basic) - Net income for the year | $ 1,680 | $ 1,558
Denominator - Number of shares (in millions): |  |
Weighted average number of shares outstanding - basic (in shares) | 505,000,000 | 505,000,000
Effect of dilutive securities (in millions): |  |
Employee stock options and restricted share units (in shares) | 1,000,000 | 1,000,000
Weighted average number of shares outstanding - diluted (in shares) | 506,000,000 | 506,000,000
Earnings per share: |  |
Basic (in dollars per share) | $ 3.33 | $ 3.09
Diluted (in dollars per share) | $ 3.32 | $ 3.07
Dilutive effect of securities on earnings per share | $ 2 | $ 3
Antidilutive securities (in shares) | 7,806,315 | 4,148,549

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