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Receivables And Other Current Assets (Summary of Receivables And Other Current Assets) (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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18. Receivables and Other Current Assets |  |
Customer accounts receivable - billed | $ 570 | $ 603
Customer accounts receivable - unbilled | 286 | 265
Allowance for credit losses | (22) | (9)
Capitalized transportation capacity | 200 | 272
Income taxes receivable | 11 | 118
Prepaid expenses | 50 | 48
Other current assets | 138 | 189
Receivables and other current assets | $ 1,233 | $ 1,486

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