XML 237 R143.htm IDEA: XBRL DOCUMENT v3.10.0.1
provisions (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
provisions reconciliation        
Balance at beginning of period $ 589 $ 519    
Additions 409 200    
Reversal (22) (70)    
Use (139) (121)    
Interest effect (1) 60    
Effects of foreign exchange, net 21 1    
Balance at end of period 857 589    
Current     $ 129 $ 78
Non-current     728 511
Total 589 519 857 589
Differences of interest effect due to change in discount rates as compared to interest accretion on provisions (22) 47    
Asset retirement obligation        
provisions reconciliation        
Balance at beginning of period 351 339    
Additions 6 13    
Reversal   (53)    
Use (10) (6)    
Interest effect (11) 58    
Balance at end of period 336 351    
Current     8 6
Non-current     328 345
Total 351 339 336 351
Employee related        
provisions reconciliation        
Balance at beginning of period 36 77    
Additions 124 39    
Reversal   (5)    
Use (72) (75)    
Balance at end of period 88 36    
Current     84 35
Non-current     4 1
Total 36 77 88 36
Written put options        
provisions reconciliation        
Balance at beginning of period 82      
Additions 207 90    
Reversal (17) (11)    
Use (13)      
Interest effect 10 2    
Effects of foreign exchange, net 21 1    
Balance at end of period 290 82    
Current     9  
Non-current     281 82
Total 82 82 290 82
Other        
provisions reconciliation        
Balance at beginning of period 120 103    
Additions 72 58    
Reversal (5) (1)    
Use (44) (40)    
Balance at end of period 143 120    
Current     28 37
Non-current     115 83
Total $ 120 $ 103 $ 143 $ 120