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Receivables and Other Current Assets (Summary of Receivables and Other Current Assets) (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Receivables and Other Current Assets [Abstract] |  |
Customer accounts receivable - billed | $ 834 | $ 805
Customer accounts receivable - unbilled | 342 | 363
Capitalized transportation capacity | 216 | 358
Cash collateral provided to others | 198 | 101
Prepaid expenses | 105 | 105
Income taxes receivable | 22 | 10
Allowance for credit losses | (12) | (15)
Other | 106 | 90
Total receivables and other current assets | $ 1,811 | $ 1,817

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