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accounting policy developments - Impacts of application of IFRS 15, Consolidated statement of cash flows (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
OPERATING ACTIVITIES    
Net income $ 1,624 $ 1,578
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 2,267 2,169
Deferred income taxes 74 467
Share-based compensation expense, net 6 17
Net employee defined benefit plans expense 95 82
Employer contributions to employee defined benefit plans (53) (67)
Non-current contract assets (62) (44)
Income from equity accounted investments (170) (4)
Shares settled from Treasury 100  
Other (79) (32)
Net change in non-cash operating working capital 256 (219)
Cash provided by operating activities 4,058 3,947
Change arising from designation of financial assets as being accounted for at fair value through net income   1
Change arising from designation of financial assets as being accounted for at fair value through other comprehensive income   (1)
Excluding effects of IFRS 15    
OPERATING ACTIVITIES    
Net income 1,476 1,480
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 2,267 2,169
Deferred income taxes 19 430
Share-based compensation expense, net 6 17
Net employee defined benefit plans expense 95 82
Employer contributions to employee defined benefit plans (53) (67)
Income from equity accounted investments (170) (4)
Shares settled from Treasury 100  
Other (76) (18)
Net change in non-cash operating working capital 394 (142)
Cash provided by operating activities 4,058 3,947
IFRS 15 effects    
OPERATING ACTIVITIES    
Net income 148 98
Adjustments to reconcile net income to cash provided by operating activities:    
Deferred income taxes 55 37
Non-current contract assets (62) (44)
Other (3) (14)
Net change in non-cash operating working capital $ (138) $ (77)