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employee future benefits - Disaggregation of defined benefit pension (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) $ 8,723 $ 9,419  
Pension plans      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) (57) 334  
PBSR interim estimate of solvency position $ 276    
PBSR prior year update of annual estimate of solvency position   390  
PBSR prior year interim estimate of solvency position   $ 255  
PBSR composite weighted average discount rate 3.00% 3.00%  
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 $ 303 $ 316  
Pension plans | Minimum      
Defined benefit pension plans - funded status overview      
PBSR interim solvency ratio 94.00% 90.00%  
PBSR annual solvency ratio   95.00%  
PBSR interim three-year solvency ratio 95.00% 93.00%  
PBSR annual three-year solvency ratio   94.00%  
Pension plans | Maximum      
Defined benefit pension plans - funded status overview      
PBSR interim solvency ratio 106.00% 105.00%  
PBSR annual solvency ratio   108.00%  
PBSR interim three-year solvency ratio 106.00% 104.00%  
PBSR annual three-year solvency ratio   105.00%  
Pension plans | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) $ 8,723 $ 9,419 $ 8,837
Pension plans | Plan assets net of Effect of asset ceiling limit      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) (8,780) (9,085)  
Pension plans | Active members | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 1,960 2,285  
Pension plans | Deferred members | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 469 560  
Pension plans | Pensioners | Present value of the defined benefit obligations      
Defined benefit pension plans - funded status overview      
Net defined liability/(assets) 6,294 6,574  
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) (503) (156)  
PBSR interim estimate of solvency position 360    
PBSR prior year update of annual estimate of solvency position   451  
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) 7,479 8,116  
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) (7,982) (8,272)  
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) 446 490  
PBSR interim estimate of solvency position (84)    
PBSR prior year update of annual estimate of solvency position   (61)  
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) 1,244 1,303  
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) (798) (813)  
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) 240 286  
PBSR interim estimate of solvency position (84)    
PBSR prior year update of annual estimate of solvency position   (61)  
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) 1,038 1,099  
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) (798) (813)  
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) 206 204  
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) $ 206 $ 204