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Post-employment benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 $ 1,657  
Interest on obligations 66 $ 108
Actuarial gains (losses) 984 (835)
Post-employment benefit obligations, December 31 2,374 1,657
Post-employment benefit assets 3,578 2,935
Post-employment benefit obligations (1,204) (1,278)
Experience gains (losses) included in actuarial gains 809 734
Actual return on plan assets $ 1,848 $ 1,898
Actual return on plan assets, percent 8.10% 8.80%
Benefit obligations    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 $ (21,669) $ (20,433)
Current service cost (135) (129)
Interest on obligations (976) (1,051)
Actuarial gains (losses) 214 (1,521)
Benefit payments 1,419 1,473
Employee contributions (8) (8)
Business combinations (33) 0
Post-employment benefit obligations, December 31 (21,188) (21,669)
Plan assets    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 24,098 23,682
Expected return on plan assets 1,078 1,212
Actuarial gains (losses) 770 686
Benefit payments (1,419) (1,473)
Employer contributions 109 105
Employee contributions 8 8
Transfers to DC plans (132) (124)
Business combinations 47 0
Other (1) 2
Post-employment benefit obligations, December 31 24,558 24,098
Plan asset (deficit)    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 2,429  
Post-employment benefit obligations, December 31 3,370 2,429
Effect of asset limit    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (719)  
Interest on obligations (36) (53)
Post-employment benefit obligations, December 31 (960) (719)
DB pension plans    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 2,401  
Current service cost (134) (128)
Interest on obligations 99 149
Post-employment benefit obligations, December 31 3,058 2,401
Post-employment benefit assets 3,578 2,935
Post-employment benefit obligations (520) (534)
DB pension plans | Benefit obligations    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (20,595) (19,295)
Current service cost (134) (128)
Interest on obligations (927) (993)
Actuarial gains (losses) 214 (1,572)
Benefit payments 1,349 1,401
Employee contributions (8) (8)
Business combinations (33) 0
Post-employment benefit obligations, December 31 (20,134) (20,595)
DB pension plans | Plan assets    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 23,768 23,355
Expected return on plan assets 1,062 1,195
Actuarial gains (losses) 737 692
Benefit payments (1,349) (1,401)
Employer contributions 48 41
Employee contributions 8 8
Transfers to DC plans (132) (124)
Business combinations 47 0
Other (1) 2
Post-employment benefit obligations, December 31 24,188 23,768
DB pension plans | Plan asset (deficit)    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 3,173  
Post-employment benefit obligations, December 31 4,054 3,173
DB pension plans | Effect of asset limit    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (719)  
Interest on obligations (36) (53)
Post-employment benefit obligations, December 31 (960) (719)
OPEB plans    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (744)  
Current service cost (1) (1)
Interest on obligations (33) (41)
Post-employment benefit obligations, December 31 (684) (744)
Post-employment benefit assets 0 0
Post-employment benefit obligations (684) (744)
OPEB plans | Benefit obligations    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (1,074) (1,138)
Current service cost (1) (1)
Interest on obligations (49) (58)
Actuarial gains (losses) 0 51
Benefit payments 70 72
Employee contributions 0 0
Business combinations 0 0
Post-employment benefit obligations, December 31 (1,054) (1,074)
OPEB plans | Plan assets    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 330 327
Expected return on plan assets 16 17
Actuarial gains (losses) 33 (6)
Benefit payments (70) (72)
Employer contributions 61 64
Employee contributions 0 0
Transfers to DC plans 0 0
Business combinations 0 0
Other 0 0
Post-employment benefit obligations, December 31 370 330
OPEB plans | Plan asset (deficit)    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (744)  
Post-employment benefit obligations, December 31 (684) (744)
OPEB plans | Effect of asset limit    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 0  
Interest on obligations 0 0
Post-employment benefit obligations, December 31 $ 0 $ 0