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Accounts Receivable, Net (Tables)
 9 Months Ended
Sep. 30, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Accounts Receivable, Allowance for Credit Loss
 
For the three months ended September 30, 2020
For the nine months ended September 30, 2020
(in millions of Canadian dollars)
Freight
Non-freight
Total
Freight
Non-freight
Total
Allowance for credit losses, opening balance(1)
$
(26
)
$
(14
)
$
(40
)
$
(27
)
$
(16
)
$
(43
)
Current period credit loss provision, net
—

—

—

1

2

3

Allowance for credit losses, closing balance
$
(26
)
$
(14
)
$
(40
)
$
(26
)
$
(14
)
$
(40
)

(1) 
Opening balance at January 1, 2020 was restated as described in Note 2
Schedule of Accounts Receivable
 
As at September 30, 2020
(in millions of Canadian dollars)
Freight
Non-freight
Total
Total accounts receivable
$
705

$
175

$
880

Allowance for credit losses
(26
)
(14
)
(40
)
Total accounts receivable, net
$
679

$
161

$
840