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Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2023
Stock-Based Compensation [Abstract]
Weighted Average Fair Values per Stock Option and Assumptions for Options Granted	2023 2022 Weighted average FV per option $ 6.32 $ 5.35 Expected term (1) 5  years 5  years Risk-free interest rate (2) 3.53 % 1.79 % Expected dividend yield (3) 5.05 % 4.55 % Expected volatility (4) 20.07 % 18.87 % (1) The expected term of the option awards is calculated based on historical exercise behaviour and represents the period of time that the options are expected to be outstanding. (2) Based on the Bank of Canada five-year government bond yields. (3) Incorporates current dividend rates and historical dividend increase patterns. (4) Estimated using the five-year historical volatility.
Summary of Stock Option Information	Total Options Non-Vested Options (1) Number of Options  Weighted average exercise price per share Number of Options Weighted average grant date fair-value Outstanding as at December 31, 2022 2,853,879 $ 50.41 1,348,400 $ 4.08 Granted  483,100 54.64 483,100 6.32 Exercised (146,475) 43.94 N/A N/A Forfeited (94,900) 56.32 (51,625) 3.61 Vested N/A N/A (526,620) 3.58 Options outstanding December 31, 2023 3,095,604 $ 51.20 1,253,255 $ 5.17 Options exercisable December 31, 2023 (2)(3) 1,842,349 $ 48.39 (1) As at December 31, 2023, there was $ 5  million of unrecognized compensation related to stock options not yet vested which is expected to be recognized over a weighted average period of approximately 3  years (2022 – $ 4  million, 3  years). (2) As at December 31, 2023, the weighted average remaining term of vested options was 5  years with an aggregate intrinsic value of $ 8  million (2022 – 5  years, $ 10  million). (3) As at December 31, 2023, the FV of options that vested in the year was $ 2  million (2022 – $ 2  million).
Summary of Activity Related to Employee and Director Deferred Share Units	Employee DSU Weighted Average Grant Date FV Director  DSU Weighted Average Grant Date FV Outstanding as at December 31, 2022 627,223 $ 41.55 664,258 $ 45.83 Granted including DRIP 85,740 47.66 117,893 49.99 Exercised N/A N/A (53,093) 49.39 Outstanding and exercisable as at December 31, 2023 712,963 $ 42.29 729,058 $ 46.24
Summary of Activity Related to Employee Performance Share Units	Employee PSU Weighted Average Grant Date FV Aggregate intrinsic value Outstanding as at December 31, 2022 690,446 $ 56.24 $ 40 Granted including DRIP 386,261 52.71 Exercised (323,155) 54.62 Forfeited (10,187) 55.15 Outstanding as at December 31, 2023 743,365 $ 55.13 $ 41
Summary of Activity Related to Employee Restricted Share Units	Employee RSU Weighted Average Grant Date FV Aggregate intrinsic value Outstanding as at December 31, 2022 508,468 $ 56.25 $ 30 Granted including DRIP 236,537 52.07 Exercised (171,537) 54.62 Forfeited (10,827) 54.76 Outstanding as at December 31, 2023 562,641 $ 55.01 $ 32

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Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

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