v3.19.2
accounting policy developments - Impacts of application of IFRS 16, Consolidated statement of income and other comprehensive income (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2019
Jun. 30, 2019
CAD ($)
$ / shares
Jun. 30, 2018
CAD ($)
$ / shares
Jun. 30, 2019
CAD ($)
$ / shares
Jun. 30, 2018
CAD ($)
$ / shares
Jun. 30, 2019
CAD ($)
Dec. 31, 2018
Jun. 30, 2018
CAD ($)
Disclosure of initial application of standards or interpretations [line items]                
Weighted-average discount rate reflected in the lease liability recognized on transition 0.0416              
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  
OPERATING REVENUES                
Operating revenues   $ 3,597 $ 3,453 $ 7,103 $ 6,830      
OPERATING EXPENSES                
Goods and services purchased   1,466 1,491 2,887 2,899      
Employee benefits expense   758 711 1,464 1,411      
Depreciation   470 411 940 822      
Amortization of intangible assets   163 148 310 287      
Total   2,857 2,761 5,601 5,419      
OPERATING INCOME   740 692 1,502 1,411      
Financing costs   189 150 357 306      
INCOME BEFORE INCOME TAXES   551 542 1,145 1,105      
Income taxes   31 145 188 296      
NET INCOME   520 397 957 809      
Other comprehensive income                
Cumulative foreign currency translation adjustment, net   11 (17) 17 (21)      
Other   18   (7)        
Other comprehensive income   29 66 10 12      
COMPREHENSIVE INCOME   549 463 967 821      
NET INCOME ATTRIBUTABLE TO:                
Common Shares   517 390 945 800 $ 1,745   $ 1,556
Non-controlling interest   3 7 12 9      
NET INCOME   520 397 957 809      
COMPREHENSIVE INCOME ATTRIBUTABLE TO:                
Common Shares   543 464 949 821      
Non-controlling interest   6 (1) 18        
COMPREHENSIVE INCOME   $ 549 $ 463 $ 967 $ 821      
NET INCOME PER COMMON SHARE                
Basic | $ / shares   $ 0.86 $ 0.66 $ 1.57 $ 1.34      
Diluted | $ / shares   $ 0.86 $ 0.66 $ 1.57 $ 1.34      
Excluding effects of IFRS 16                
OPERATING REVENUES                
Operating revenues   $ 3,596   $ 7,102        
OPERATING EXPENSES                
Goods and services purchased   1,532   3,036        
Employee benefits expense   758   1,464        
Depreciation   424   846        
Amortization of intangible assets   163   310        
Total   2,877   5,656        
OPERATING INCOME   719   1,446        
Financing costs   173   326        
INCOME BEFORE INCOME TAXES   546   1,120        
Income taxes   29   181        
NET INCOME   517   939        
Other comprehensive income                
Cumulative foreign currency translation adjustment, net   12   13        
Other   18   (7)        
Other comprehensive income   30   6        
COMPREHENSIVE INCOME   547   945        
NET INCOME ATTRIBUTABLE TO:                
Common Shares   513   926        
Non-controlling interest   4   13        
NET INCOME   517   939        
COMPREHENSIVE INCOME ATTRIBUTABLE TO:                
Common Shares   540   928        
Non-controlling interest   7   17        
COMPREHENSIVE INCOME   $ 547   $ 945        
NET INCOME PER COMMON SHARE                
Basic | $ / shares   $ 0.85   $ 1.54        
Diluted | $ / shares   $ 0.85   $ 1.54        
IFRS 16 effects                
OPERATING REVENUES                
Operating revenues   $ 1   $ 1        
OPERATING EXPENSES                
Goods and services purchased   (66)   (149)        
Depreciation   46   94        
Total   (20)   (55)        
OPERATING INCOME   21   56        
Financing costs   16   31        
INCOME BEFORE INCOME TAXES   5   25        
Income taxes   2   7        
NET INCOME   3   18        
Other comprehensive income                
Cumulative foreign currency translation adjustment, net   (1)   4        
Other comprehensive income   (1)   4        
COMPREHENSIVE INCOME   2   22        
NET INCOME ATTRIBUTABLE TO:                
Common Shares   4   19        
Non-controlling interest   (1)   (1)        
NET INCOME   3   18        
COMPREHENSIVE INCOME ATTRIBUTABLE TO:                
Common Shares   3   21        
Non-controlling interest   (1)   1        
COMPREHENSIVE INCOME   $ 2   $ 22        
NET INCOME PER COMMON SHARE                
Basic | $ / shares   $ 0.01   $ 0.03        
Diluted | $ / shares   $ 0.01   $ 0.03