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Debt due within one year - Narrative (Details) | Dec. 06, 2018 CAD ($) | Oct. 17, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Unsecured revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Maximum borrowing capacity |  |  | $ 2,500,000,000.0 |
Unsecured revolving credit facility and expansion facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Maximum borrowing capacity |  |  | 4,000,000,000 |
Commercial paper |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Maximum borrowing capacity |  |  | 3,000,000,000 | $ 3,000,000,000
Increase in line of credit facility | $ 500,000,000 |  |  |
Committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Maximum borrowing capacity |  |  | $ 4,134,000,000 |
Increase in line of credit facility |  | $ 500,000,000 |  |

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- Definition Line Of Credit Facility, Increase (Decrease), Net + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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