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accounting policy developments - Impacts of application of IFRS 16 on consolidated statements of financial position (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Jan. 01, 2019
CAD ($)
Dec. 31, 2017
CAD ($)
Jan. 01, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Non-current assets          
Property, plant and equipment, net $ 12,091 $ 12,100 $ 11,368 $ 10,464  
Current liabilities          
Provisions 129 100 78 124  
Current maturities of long-term debt 836 800 1,404 1,327  
Non-current liabilities          
Provisions 728 700 511 395  
Long-term debt 13,265 13,300 12,256 11,604  
Other long-term liabilities 738 700 847 736  
Deferred income taxes 3,152 3,200 2,941 2,511  
Owners' equity          
Retained earnings   4,500      
Accumulated other comprehensive income 4   53   $ 41
Non-controlling interests $ 82 100 $ 42 $ 19  
Weighted-average discount rate reflected in the lease liability recognized on transition 4.55        
Impact from discounting minimum lease payments (as a percent) 0.667        
Impact from including payments for leases that commence subsequent to December 31, 2018 (as a percent) 0.333        
Maximum          
Owners' equity          
Accumulated other comprehensive income   100      
IFRS 16 effects          
Non-current assets          
Property, plant and equipment, net   1,000      
Current liabilities          
Current maturities of long-term debt   200      
Non-current liabilities          
Long-term debt   1,100      
Deferred income taxes   (100)      
Owners' equity          
Retained earnings   (200)      
IFRS 16 effects | Maximum          
Current liabilities          
Provisions   100      
Non-current liabilities          
Provisions   100      
Other long-term liabilities   100      
Owners' equity          
Accumulated other comprehensive income   100      
Non-controlling interests   100      
Pro forma          
Non-current assets          
Property, plant and equipment, net   13,100      
Current liabilities          
Provisions   100      
Current maturities of long-term debt   1,000      
Non-current liabilities          
Provisions   700      
Long-term debt   14,400      
Other long-term liabilities   700      
Deferred income taxes   3,100      
Owners' equity          
Retained earnings   4,300      
Non-controlling interests   100      
Pro forma | Maximum          
Owners' equity          
Accumulated other comprehensive income   $ 100