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Accounts Receivable, Net
9 Months Ended
Sep. 30, 2022
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Accounts Receivable, Net Accounts receivable, net
As at September 30, 2022As at December 31, 2021
(in millions of Canadian dollars)FreightNon-freightTotalFreightNon-freightTotal
Total accounts receivable$835 $257 $1,092 $614 $239 $853 
Allowance for credit losses(26)(13)(39)(20)(14)(34)
Total accounts receivable, net$809 $244 $1,053 $594 $225 $819 

For the three months ended September 30, 2022For the three months ended September 30, 2021
(in millions of Canadian dollars)FreightNon-freightTotalFreightNon-freightTotal
Allowance for credit losses, opening balance$(24)$(15)$(39)$(23)$(15)$(38)
Current period credit loss provision, net(2)2  (1)— 
Allowance for credit losses, closing balance$(26)$(13)$(39)$(22)$(16)$(38)

For the nine months ended September 30, 2022For the nine months ended September 30, 2021
(in millions of Canadian dollars)FreightNon-freightTotalFreightNon-freightTotal
Allowance for credit losses, opening balance$(20)$(14)$(34)$(25)$(15)$(40)
Current period credit loss provision, net(6)1 (5)(1)
Allowance for credit losses, closing balance$(26)$(13)$(39)$(22)$(16)$(38)