Accounts receivable, net (Tables)

12 Months Ended

Dec. 31, 2021

Receivables [Abstract]

Schedule of Accounts Receivable, Net

	As at December 31, 2021						As at December 31, 2020
(in millions of Canadian dollars)	Freight		Non-Freight		Total		Freight		Non-Freight		Total
Total accounts receivable	$	614	$	239	$	853	$	662	$	203	$	865
Allowance for credit losses	(20)		(14)		(34)		(25)		(15)		(40)
Total accounts receivable, net	$	594	$	225	$	819	$	637	$	188	$	825

Accounts Receivable, Allowance for Credit Loss

	For the twelve months ended December 31, 2021						For the twelve months ended December 31, 2020
(in millions of Canadian dollars)	Freight		Non-Freight		Total		Freight		Non-Freight		Total
Allowance for credit losses, opening balance	$	(25)	$	(15)	$	(40)	$	(27)	$	(16)	$	(43)
Current period credit loss provision, net	5		1		6		2		1		3
Allowance for credit losses, closing balance	$	(20)	$	(14)	$	(34)	$	(25)	$	(15)	$	(40)