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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
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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Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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