Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Schedule of Accounts Receivable, Net

	As at December 31, 2020						As at December 31, 2019(1)
(in millions of Canadian dollars)	Freight		Non-Freight		Total		Freight		Non-Freight		Total
Total accounts receivable	$	662	$	203	$	865	$	637	$	210	$	847
Allowance for credit losses	(25)		(15)		(40)		(26)		(16)		(42)
Total accounts receivable, net	$	637	$	188	$	825	$	611	$	194	$	805

(1) Prior year amounts have not been adjusted under the modified retrospective method (Note 2).

Accounts Receivable, Allowance for Credit Loss

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

(1) Opening balance at January 1, 2020 was restated as described in Note 2.