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Post-employee benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 $ (1,349)  
Interest on obligations (46) $ (63)
Actuarial gains (losses) 732 191
Post-employment benefit obligations, December 31 (685) (1,349)
Post-employment benefit assets 1,277 558
Post-employment benefit obligations (1,962) (1,907)
Experience gains (losses) included in actuarial gains 2,613 2,525
Actual return on plan assets $ 3,434 $ 3,633
Actual return on plan assets percent 13.70% 16.00%
Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 $ (27,179) $ (24,873)
Current service cost (221) (196)
Interest on obligations (828) (927)
Actuarial gains (losses) (1,920) (2,578)
Benefit payments 1,409 1,403
Employee contributions (10) (10)
Other 0 2
Post-employment benefit obligations, December 31 (28,749) (27,179)
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 25,850 23,358
Interest on obligations 782 864
Actuarial gains (losses) 2,652 2,769
Benefit payments (1,409) (1,403)
Employer contributions 244 252
Employee contributions 10 10
Post-employment benefit obligations, December 31 28,129 25,850
Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,329)  
Post-employment benefit obligations, December 31 (620) (1,329)
Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (20)  
Post-employment benefit obligations, December 31 (65) (20)
DB PENSION PLANS    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (140)  
Current service cost (219) (193)
Interest on obligations (10) (19)
Post-employment benefit obligations, December 31 571 (140)
Post-employment benefit assets 1,277 558
Post-employment benefit obligations (706) (698)
DB PENSION PLANS | Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (25,650) (23,404)
Current service cost (219) (193)
Interest on obligations (782) (872)
Actuarial gains (losses) (1,830) (2,498)
Benefit payments 1,342 1,326
Employee contributions (10) (10)
Other 0 1
Post-employment benefit obligations, December 31 (27,149) (25,650)
DB PENSION PLANS | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 25,530 23,071
Interest on obligations 772 853
Actuarial gains (losses) 2,632 2,742
Benefit payments (1,342) (1,326)
Employer contributions 183 180
Employee contributions 10 10
Post-employment benefit obligations, December 31 27,785 25,530
DB PENSION PLANS | Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (120)  
Post-employment benefit obligations, December 31 636 (120)
DB PENSION PLANS | Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (20)  
Post-employment benefit obligations, December 31 (65) (20)
OPEB PLANS    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,209)  
Current service cost (2) (3)
Interest on obligations (36) (44)
Post-employment benefit obligations, December 31 (1,256) (1,209)
Post-employment benefit assets 0 0
Post-employment benefit obligations (1,256) (1,209)
OPEB PLANS | Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,529) (1,469)
Current service cost (2) (3)
Interest on obligations (46) (55)
Actuarial gains (losses) (90) (80)
Benefit payments 67 77
Employee contributions 0 0
Other 0 1
Post-employment benefit obligations, December 31 (1,600) (1,529)
OPEB PLANS | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 320 287
Interest on obligations 10 11
Actuarial gains (losses) 20 27
Benefit payments (67) (77)
Employer contributions 61 72
Employee contributions 0 0
Post-employment benefit obligations, December 31 344 320
OPEB PLANS | Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,209)  
Post-employment benefit obligations, December 31 (1,256) (1,209)
OPEB PLANS | Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 0  
Post-employment benefit obligations, December 31 $ 0 $ 0