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Major Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Loss Contingencies [Line Items]  
Provision for specific environmental sites
Environmental provisions
In millions202320222021
Beginning of year$59 $56 $59 
   Accruals and other17 27 23 
   Payments(19)(26)(26)
   Foreign exchange1 2 — 
End of year$58 $59 $56 
Current portion - End of year$39 $41 $38 
Employee injuries, Canada [Member]  
Loss Contingencies [Line Items]  
Provision for personal injury and other claims
In millions202320222021
Beginning of year$168 $182 $206 
Accruals and other
44 16 12 
Payments
(32)(30)(36)
End of year$180 $168 $182 
Current portion - End of year$24 $27 $50 
Employee injuries, United States [Member]  
Loss Contingencies [Line Items]  
Provision for personal injury and other claims
In millions202320222021
Beginning of year$128 $125 $141 
Accruals and other
34 33 30 
Payments
(28)(39)(45)
Foreign exchange
(3)9 (1)
End of year$131 $128 $125 
Current portion - End of year$27 $18 $25