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employee future benefits - Disaggregation of defined benefit pension (Details) - Pension plans - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) $ (913) $ (425)  
PBSR interim estimate of solvency position $ 375    
PBSR prior year update of annual estimate of solvency position   372  
PBSR prior year interim estimate of solvency position   $ 568  
PBSR composite weighted average discount rate 2.60% 2.90%  
Hypothetical basis points decrease in PBSR composite weighted average discount rate (as a per cent) 0.25% 0.25%  
Decrease in the PBSR solvency position with hypothetical decrease of 25 basis points in the composite weighted average discount rate $ 330 $ 295  
Minimum      
Defined benefit pension plans - funded status overview      
PBSR interim solvency ratio 95.00% 98.00%  
PBSR annual solvency ratio   96.00%  
PBSR interim three-year solvency ratio 97.00% 98.00%  
PBSR annual three-year solvency ratio   97.00%  
Maximum      
Defined benefit pension plans - funded status overview      
PBSR interim solvency ratio 109.00% 112.00%  
PBSR annual solvency ratio   109.00%  
PBSR interim three-year solvency ratio 109.00% 109.00%  
PBSR annual three-year solvency ratio   108.00%  
Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) $ 10,521 $ 9,684 $ 8,723
Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 9,608 9,259  
Active members | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 2,461 2,184  
Deferred members | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 561 513  
Pensioners | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 7,499 6,987  
Pension plans that have plan assets in excess of defined benefit obligations accrued      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 13 155  
PBSR interim estimate of solvency position 524    
PBSR prior year update of annual estimate of solvency position   473  
Pension plans that have plan assets in excess of defined benefit obligations accrued | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 708 8,277  
Pension plans that have plan assets in excess of defined benefit obligations accrued | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 721 8,432  
Pension plans that have defined benefit obligations accrued in excess of plan assets      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) (926) (580)  
PBSR interim estimate of solvency position (149)    
PBSR prior year update of annual estimate of solvency position   (101)  
Pension plans that have defined benefit obligations accrued in excess of plan assets | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 9,813 1,407  
Pension plans that have defined benefit obligations accrued in excess of plan assets | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 8,887 827  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) (663) (340)  
PBSR interim estimate of solvency position (149)    
PBSR prior year update of annual estimate of solvency position   (101)  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 9,550 1,167  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 8,887 827  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) (263) (240)  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) $ 263 $ 240