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Stock-Based Compensation Plans - Schedule of PSU and RSU Plans Activity (Details) - CAD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
PSUs
Number of units (thousands)
Outstanding, beginning of year (shares)	1,790	1,898
Granted (shares)	722	580
Notional dividends reinvested (shares)	66	58
Paid out (shares)	(606)	(712)
Cancelled/forfeited (shares)	(30)	(34)
Outstanding, end of year (shares)	1,942	1,790
Additional information ($ millions)
Compensation expense recognized	$ 45	$ 25
Compensation expense unrecognized	28	24
Cash payout	46	66
Accrued liability as at December 31	90	90
Aggregate intrinsic value as at December 31	$ 118	$ 114
Remaining weighted average period to recognize compensation expense (years)	2 years
Weighted-average contractual life (years)	1 year
RSUs
Number of units (thousands)
Outstanding, beginning of year (shares)	977	1,060
Granted (shares)	416	331
Notional dividends reinvested (shares)	35	29
Paid out (shares)	(323)	(410)
Cancelled/forfeited (shares)	(26)	(33)
Outstanding, end of year (shares)	1,079	977
Additional information ($ millions)
Compensation expense recognized	$ 21	$ 16
Compensation expense unrecognized	17	16
Cash payout	17	25
Accrued liability as at December 31	42	40
Aggregate intrinsic value as at December 31	$ 59	$ 56
Remaining weighted average period to recognize compensation expense (years)	2 years
Weighted-average contractual life (years)	1 year

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash paid to settle liability for award under share-based payment arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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