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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Accounts receivable
The following table provides the breakdown of Accounts receivable as at December 31, 2021 and 2020:
In millionsDecember 31,20212020
Freight$877 $869 
Non-freight225 211 
Gross accounts receivable1,102 1,080 
Allowance for credit losses
(28)(26)
Net accounts receivable$1,074 $1,054