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Employee Future Benefits - Schedule of Funded Status (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Change in value of plan assets |  |
Balance, beginning of year | $ 3,743 |
Balance, end of year | 4,119 | $ 3,743
Other assets (Note 9) | 551 | 355
Other liabilities (Note 16) | (446) | (527)
DBP Plans |  |
Change in benefit obligation |  |
Balance, beginning of year | 3,347 | 3,063
Service costs | 74 | 62
Employee contributions | 17 | 17
Interest costs | 161 | 159
Benefits paid | (181) | (169)
Actuarial (gains) losses | (115) | 255
Past service credits/plan amendments | (3) | 0
Foreign currency translation | 140 | (40)
Balance, end of year | 3,440 | 3,347
Change in value of plan assets |  |
Balance, beginning of year | 3,313 | 3,079
Actual return on plan assets | 249 | 373
Benefits paid | (174) | (162)
Employee contributions | 17 | 17
Employer contributions | 57 | 46
Foreign currency translation | 151 | (40)
Balance, end of year | 3,613 | 3,313
Funded status | 173 | (34)
Other assets (Note 9) | 395 | 236
Other current liabilities (Note 13) | (16) | (15)
Other liabilities (Note 16) | (206) | (255)
Net liabilities | 173 | (34)
Accumulated benefit obligation | 3,144 | 2,983
OPEB Plans |  |
Change in benefit obligation |  |
Balance, beginning of year | 596 | 582
Service costs | 25 | 22
Employee contributions | 4 | 3
Interest costs | 29 | 30
Benefits paid | (35) | (31)
Actuarial (gains) losses | (49) | (1)
Past service credits/plan amendments | 0 | 0
Foreign currency translation | 33 | (9)
Balance, end of year | 603 | 596
Change in value of plan assets |  |
Balance, beginning of year | 430 | 389
Actual return on plan assets | 50 | 61
Benefits paid | (31) | (26)
Employee contributions | 4 | 3
Employer contributions | 14 | 13
Foreign currency translation | 39 | (10)
Balance, end of year | 506 | 430
Funded status | (97) | (166)
Other assets (Note 9) | 156 | 119
Other current liabilities (Note 13) | (13) | (13)
Other liabilities (Note 16) | (240) | (272)
Net liabilities | $ (97) | $ (166)

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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