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employee future benefits - Disaggregation of defined benefit pension (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) $ 9,684 $ 8,723  
Pension plans      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) (425) 57  
PBSR interim estimate of solvency position $ 568    
PBSR prior year update of annual estimate of solvency position   401  
PBSR prior year interim estimate of solvency position   $ 276  
PBSR composite weighted average discount rate 3.00% 3.24%  
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 $ 295 $ 303  
Pension plans | Minimum      
Defined benefit pension plans – funded status overview      
PBSR interim solvency ratio 98.00% 94.00%  
PBSR annual solvency ratio   97.00%  
PBSR interim three-year solvency ratio 98.00% 95.00%  
PBSR annual three-year solvency ratio   96.00%  
Pension plans | Maximum      
Defined benefit pension plans – funded status overview      
PBSR interim solvency ratio 112.00% 106.00%  
PBSR annual solvency ratio   109.00%  
PBSR interim three-year solvency ratio 109.00% 106.00%  
PBSR annual three-year solvency ratio   107.00%  
Pension plans | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) $ 9,684 $ 8,723 $ 9,419
Pension plans | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 9,259 8,780  
Pension plans | Active members | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 2,184 1,960  
Pension plans | Deferred members | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 513 469  
Pension plans | Pensioners | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 6,987 6,294  
Pension plans that have plan assets in excess of defined benefit obligations accrued | Pension plans      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 155 503  
PBSR interim estimate of solvency position 626    
PBSR prior year update of annual estimate of solvency position   460  
Pension plans that have plan assets in excess of defined benefit obligations accrued | Pension plans | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 8,277 7,479  
Pension plans that have plan assets in excess of defined benefit obligations accrued | Pension plans | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 8,432 7,982  
Pension plans that have defined benefit obligations accrued in excess of plan assets | Pension plans      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) (580) (446)  
PBSR interim estimate of solvency position (58)    
PBSR prior year update of annual estimate of solvency position   (59)  
Pension plans that have defined benefit obligations accrued in excess of plan assets | Pension plans | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 1,407 1,244  
Pension plans that have defined benefit obligations accrued in excess of plan assets | Pension plans | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 827 798  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Pension plans      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) (340) (240)  
PBSR interim estimate of solvency position (58)    
PBSR prior year update of annual estimate of solvency position   (59)  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Pension plans | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 1,167 1,038  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Pension plans | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) 827 798  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded | Pension plans      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) (240) (206)  
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded | Pension plans | Present value of the defined benefit obligations      
Defined benefit pension plans – funded status overview      
Net defined liability/(assets) $ 240 $ 206