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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)