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Debt due within one year - Summary of Total Bank Credit Facilities (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Jan. 01, 2017 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
DRAWN | $ 525,000,000 |  | $ 1,106,000,000 | $ 1,307,000,000
Unsecured revolving credit facility and expansion facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | 4,000,000,000 |  |  |
DRAWN | 0 |  |  |
LETTERS OF CREDIT | 0 |  |  |
COMMERCIAL PAPER OUTSTANDING | 3,156,000,000 | $ 2,314 |  |
NET AVAILABLE | 844,000,000 |  |  |
Other |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | 134,000,000 |  |  |
DRAWN | 0 |  |  |
LETTERS OF CREDIT | 107,000,000 |  |  |
COMMERCIAL PAPER OUTSTANDING | 0 |  |  |
NET AVAILABLE | 27,000,000 |  |  |
Total committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | 4,134,000,000 |  |  |
DRAWN | 0 |  |  |
LETTERS OF CREDIT | 107,000,000 |  |  |
COMMERCIAL PAPER OUTSTANDING | 3,156,000,000 |  |  |
NET AVAILABLE | 871,000,000 |  |  |
Total non-committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | 3,014,000,000 |  |  |
DRAWN | 0 |  |  |
LETTERS OF CREDIT | 1,964,000,000 |  |  |
COMMERCIAL PAPER OUTSTANDING | 0 |  |  |
NET AVAILABLE | 1,050,000,000 |  |  |
Total committed and non-committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | 7,148,000,000 |  |  |
DRAWN | 0 |  |  |
LETTERS OF CREDIT | 2,071,000,000 |  |  |
COMMERCIAL PAPER OUTSTANDING | 3,156,000,000 |  |  |
NET AVAILABLE | 1,921,000,000 |  |  |
Unsecured revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | 2,500,000,000.0 |  |  |
Unsecured expansion facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | 1,000,000,000 |  |  |
Revolving facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
TOTAL AVAILABLE | $ 500,000,000 |  |  |
Term loan |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt Instrument, Term1 | 1 year |  |  |

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