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Post-employment benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 $ 2,248  
Interest on obligations 108 $ 51
Actuarial gains (losses) (835) 894
Transfers to DC plans (124) (57)
Post-employment benefit obligations, December 31 1,657 2,248
Post-employment benefit assets 2,935 3,559
Post-employment benefit obligations (1,278) (1,311)
Experience gains (losses) included in actuarial gains 734 (4,729)
Actual return on plan assets $ 1,898 $ (3,370)
Actual return on plan assets, percent 8.80% (11.60%)
Benefit obligations    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 $ (20,433) $ (26,001)
Current service cost (129) (195)
Interest on obligations (1,051) (814)
Actuarial gains (losses) (1,521) 5,150
Benefit payments 1,473 1,436
Employee contributions (8) (9)
Other 0 0
Post-employment benefit obligations, December 31 (21,669) (20,433)
Plan assets    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 23,682 28,391
Interest on obligations 1,212 886
Actuarial gains (losses) 686 (4,256)
Benefit payments (1,473) (1,436)
Employer contributions 105 145
Employee contributions 8 9
Other 2 0
Post-employment benefit obligations, December 31 24,098 23,682
Plan asset (deficit)    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 3,249  
Post-employment benefit obligations, December 31 2,429 3,249
Effect of asset limit    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (980)  
Interest on obligations (53) (21)
Post-employment benefit obligations, December 31 (719) (980)
DB PENSION PLANS    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 3,059  
Current service cost (128) (193)
Interest on obligations 149 84
Post-employment benefit obligations, December 31 2,401 3,059
Post-employment benefit assets 2,935 3,559
Post-employment benefit obligations (534) (500)
DB PENSION PLANS | Benefit obligations    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (19,295) (24,544)
Current service cost (128) (193)
Interest on obligations (993) (770)
Actuarial gains (losses) (1,572) 4,856
Benefit payments 1,401 1,366
Employee contributions (8) (9)
Other 0 (1)
Post-employment benefit obligations, December 31 (20,595) (19,295)
DB PENSION PLANS | Plan assets    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 23,355 28,040
Interest on obligations 1,195 875
Actuarial gains (losses) 692 (4,227)
Benefit payments (1,401) (1,366)
Employer contributions 41 81
Employee contributions 8 9
Transfers to DC plans (124) (57)
Other 2 0
Post-employment benefit obligations, December 31 23,768 23,355
DB PENSION PLANS | Plan asset (deficit)    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 4,060  
Post-employment benefit obligations, December 31 3,173 4,060
DB PENSION PLANS | Effect of asset limit    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (980)  
Interest on obligations (53) (21)
Post-employment benefit obligations, December 31 (719) (980)
OPEB PLANS    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (811)  
Current service cost (1) (2)
Interest on obligations (41) (33)
Post-employment benefit obligations, December 31 (744) (811)
Post-employment benefit assets 0 0
Post-employment benefit obligations (744) (811)
OPEB PLANS | Benefit obligations    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (1,138) (1,457)
Current service cost (1) (2)
Interest on obligations (58) (44)
Actuarial gains (losses) 51 294
Benefit payments 72 70
Employee contributions 0 0
Other 0 1
Post-employment benefit obligations, December 31 (1,074) (1,138)
OPEB PLANS | Plan assets    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 327 351
Interest on obligations 17 11
Actuarial gains (losses) (6) (29)
Benefit payments (72) (70)
Employer contributions 64 64
Employee contributions 0 0
Transfers to DC plans 0 0
Other 0 0
Post-employment benefit obligations, December 31 330 327
OPEB PLANS | Plan asset (deficit)    
Reconciliation of changes in net assets available for benefits [abstract]    
Post-employment benefit obligations, January 1 (811)  
Post-employment benefit obligations, December 31 (744) (811)
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