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EARNINGS PER SHARE (Details) - CAD ($) $ / shares in Units, $ in Millions	12 Months Ended
	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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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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