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Major Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2024
Loss Contingencies [Line Items]  
Provision for specific environmental sites
In millions202420232022
Beginning of year$58 $59 $56 
   Accruals and other15 17 27 
   Payments(19)(19)(26)
   Foreign exchange2 1 2 
End of year$56 $58 $59 
Current portion - End of year$40 $39 $41 
Employee injuries, Canada [Member]  
Loss Contingencies [Line Items]  
Provision for personal injury and other claims
In millions202420232022
Beginning of year$180 $168 $182 
Accruals and other
41 44 16 
Payments
(56)(32)(30)
End of year$165 $180 $168 
Current portion - End of year$29 $24 $27 
Employee injuries, United States [Member]  
Loss Contingencies [Line Items]  
Provision for personal injury and other claims
In millions202420232022
Beginning of year$131 $128 $125 
Accruals and other
43 34 33 
Payments
(65)(28)(39)
Foreign exchange
10 (3)9 
End of year$119 $131 $128 
Current portion - End of year$18 $27 $18