Accounts Receivable, Net (Tables)

3 Months Ended

Mar. 31, 2022

Accounts Receivable, after Allowance for Credit Loss [Abstract]

Schedule of Accounts Receivable, Net

	As at March 31, 2022						As at December 31, 2021
(in millions of Canadian dollars)	Freight		Non-freight		Total		Freight		Non-freight		Total
Total accounts receivable	$	599	$	255	$	854	$	614	$	239	$	853
Allowance for credit losses	(22)		(14)		(36)		(20)		(14)		(34)
Total accounts receivable, net	$	577	$	241	$	818	$	594	$	225	$	819

Allowance for Credit Losses

	For the three months ended March 31, 2022						For the three months ended March 31, 2021
(in millions of Canadian dollars)	Freight		Non-freight		Total		Freight		Non-freight		Total
Allowance for credit losses, opening balance	$	(20)	$	(14)	$	(34)	$	(25)	$	(15)	$	(40)
Current period credit loss provision, net	(2)		—		(2)		1		—		1
Allowance for credit losses, closing balance	$	(22)	$	(14)	$	(36)	$	(24)	$	(15)	$	(39)