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Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable, Net Accounts receivable, net
(in millions of Canadian dollars)
2019

2018

Freight
$
637

$
677

Non-freight
210

168

 
847

845

Allowance for doubtful accounts
(42
)
(30
)
Total accounts receivable, net
$
805

$
815


The Company maintains an allowance for doubtful accounts based on expected collectability of accounts receivable. The Allowance for doubtful accounts is based on specific identification of uncollectable accounts, the application of historical percentages by aging category, and an assessment of the current economic environment.