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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, 2024 | Dec. 31, 2023
PSUs |  |
Number of units (thousands) |  |
Outstanding, beginning of year (shares) | 1,942 | 1,790
Granted (shares) | 788 | 722
Notional dividends reinvested (shares) | 78 | 66
Paid out (shares) | (609) | (606)
Cancelled/forfeited (shares) | (28) | (30)
Outstanding, end of year (shares) | 2,171 | 1,942
Additional information ($ millions) |  |
Compensation expense recognized | $ 53 | $ 45
Compensation expense unrecognized | 34 | 28
Cash payout | 44 | 46
Accrued liability as at December 31 | 105 | 90
Aggregate intrinsic value as at December 31 | $ 139 | $ 118
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) | 1,079 | 977
Granted (shares) | 464 | 416
Notional dividends reinvested (shares) | 38 | 35
Paid out (shares) | (357) | (323)
Cancelled/forfeited (shares) | (23) | (26)
Outstanding, end of year (shares) | 1,201 | 1,079
Additional information ($ millions) |  |
Compensation expense recognized | $ 29 | $ 21
Compensation expense unrecognized | 21 | 17
Cash payout | 19 | 17
Accrued liability as at December 31 | 54 | 42
Aggregate intrinsic value as at December 31 | $ 75 | $ 59
Remaining weighted average period to recognize compensation expense (years) | 2 years |
Weighted-average contractual life (years) | 1 year |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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