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Major Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Loss Contingencies [Line Items]  
Provision for specific environmental sites
As at December 31, 2021, 2020 and 2019, the Company's provision for specific environmental sites was as follows:
In millions202120202019
Beginning of year$59 $57 $61 
   Accruals and other23 44 31 
   Payments(26)(42)(34)
   Foreign exchange— — (1)
End of year$56 $59 $57 
Current portion - End of year$38 $46 $38 
Employee injuries, Canada [Member]  
Loss Contingencies [Line Items]  
Provision for personal injury and other claims
As at December 31, 2021, 2020 and 2019, the Company's provision for personal injury and other claims in Canada was as follows:
In millions202120202019
Beginning of year$206 $207 $207 
Accruals and other
12 31 29 
Payments
(36)(32)(29)
End of year$182 $206 $207 
Current portion - End of year$50 $68 $55 
Employee injuries, United States [Member]  
Loss Contingencies [Line Items]  
Provision for personal injury and other claims
As at December 31, 2021, 2020 and 2019, the Company's provision for personal injury and other claims in the U.S. was as follows:
In millions202120202019
Beginning of year$141 $145 $139 
Accruals and other
30 28 44 
Payments
(45)(29)(31)
Foreign exchange
(1)(3)(7)
End of year$125 $141 $145 
Current portion - End of year$25 $41 $36