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Commitments, Contingencies And Guarantees (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Commitments, Contingencies and guarantees    
Product transportation and storage $ 18,600  
Energy services 865  
Exploration work commitments 567  
Other 1,115  
Operating leases 2,457  
Total 23,604  
Operating lease expense 324 $ 400
2019    
Commitments, Contingencies and guarantees    
Product transportation and storage 1,053  
Energy services 139  
Exploration work commitments 33  
Other 358  
Operating leases 346  
Total 1,929  
2020    
Commitments, Contingencies and guarantees    
Product transportation and storage 948  
Energy services 136  
Other 283  
Operating leases 304  
Total 1,671  
2021    
Commitments, Contingencies and guarantees    
Product transportation and storage 1,058  
Energy services 173  
Exploration work commitments 44  
Other 135  
Operating leases 266  
Total 1,676  
2022    
Commitments, Contingencies and guarantees    
Product transportation and storage 1,181  
Energy services 116  
Other 75  
Operating leases 203  
Total 1,575  
2023    
Commitments, Contingencies and guarantees    
Product transportation and storage 1,149  
Energy services 118  
Other 69  
Operating leases 156  
Total 1,492  
Thereafter    
Commitments, Contingencies and guarantees    
Product transportation and storage 13,211  
Energy services 183  
Exploration work commitments 490  
Other 195  
Operating leases 1,182  
Total $ 15,261