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STOCK OPTION AND STOCK UNIT PLANS - PSUs and RSUs (Details) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Number |  |  |
Dividend reinvestment (in shares) | 237 |  |
Performance Stock Units (PSUs) |  |  |
Number |  |  |
Units outstanding at beginning of year (in shares) | 3,180 |  |
Units granted (in shares) | 1,444 |  |
Units cancelled (in shares) | (104) |  |
Units matured (in shares) | (1,355) |  |
Units outstanding at end of year (in shares) | 3,402 | 3,180 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 7 months 6 days |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ 244 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ 65 | $ 123 | $ 90
Restricted Stock Units (RSU) |  |  |
Number |  |  |
Units outstanding at beginning of year (in shares) | 3,571 |  |
Units granted (in shares) | 1,758 |  |
Units cancelled (in shares) | (112) |  |
Units matured (in shares) | (1,910) |  |
Dividend reinvestment (in shares) | 284 |  |
Units outstanding at end of year (in shares) | 3,591 | 3,571 |
Weighted Average Grant Date Fair Value |  |  |
Units outstanding at beginning of year | $ 50.69 |  |
Units granted | 48.50 |  |
Units cancelled | 51.38 |  |
Units matured | 49.99 |  |
Dividend reinvestment | 50.94 |  |
Units outstanding at end of year | $ 51.10 | $ 50.69 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ 187 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ 40 | $ 56 | $ 32

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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