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provisions (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
CAD ($)
Jun. 30, 2025
CAD ($)
provisions reconciliation    
Balance as at beginning of period $ 869 $ 922
Additions 132 234
Reversals (7) (30)
Uses (125) (264)
Interest effects 7 14
Effects of foreign exchange, net (12) (12)
Balance as at end of period 864 864
Current 244 244
Non-current 620 620
Total 864 864
Asset retirement obligations    
provisions reconciliation    
Balance as at beginning of period 373 378
Reversals   (8)
Uses (3) (4)
Interest effects 4 8
Balance as at end of period 374 374
Current 15 15
Non-current 359 359
Total 374 374
Employee-related    
provisions reconciliation    
Balance as at beginning of period 84 133
Additions 83 145
Reversals (1) (1)
Uses (84) (193)
Effects of foreign exchange, net (2) (2)
Balance as at end of period 82 82
Current 78 78
Non-current 4 4
Total 82 82
Written put options and contingent consideration    
provisions reconciliation    
Balance as at beginning of period 220 210
Additions 7 27
Reversals (2) (15)
Interest effects 3 6
Effects of foreign exchange, net (9) (9)
Balance as at end of period 219 219
Current 82 82
Non-current 137 137
Total 219 219
Other    
provisions reconciliation    
Balance as at beginning of period 192 201
Additions 42 62
Reversals (6) (6)
Uses (38) (67)
Effects of foreign exchange, net (1) (1)
Balance as at end of period 189 189
Current 69 69
Non-current 120 120
Total $ 189 $ 189