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Receivables And Other Current Assets (Summary of Receivables And Other Current Assets) (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
17. Receivables and Other Current Assets    
Customer accounts receivable - billed $ 704 $ 844
Customer accounts receivable - unbilled 265 296
Allowance for Doubtful Accounts (9) (11)
Other receivables 72 86
Capitalized transportation capacity 272 179
Income taxes receivable 118 175
Prepaid expenses 48 42
Net investment in direct financing lease (note 18) 9 9
Other current assets 7 0
Receivables and other current assets $ 1,486 $ 1,620