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Debt due within one year - Summary of Total Bank Credit Facilities (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
DRAWN |  | $ 975,000,000 | $ 837,000,000
Unsecured revolving credit facility and expansion facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
TOTAL AVAILABLE |  | 3,500,000,000 |
DRAWN |  | 0 |
LETTERS OF CREDIT |  | 0 |
COMMERCIAL PAPER OUTSTANDING | $ 274 | 349,000,000 |
NET AVAILABLE |  | 3,151,000,000 |
Other |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
TOTAL AVAILABLE |  | 106,000,000 |
DRAWN |  | 0 |
LETTERS OF CREDIT |  | 106,000,000 |
COMMERCIAL PAPER OUTSTANDING |  | 0 |
NET AVAILABLE |  | 0 |
Total committed credit facilities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
TOTAL AVAILABLE |  | 3,606,000,000 |
DRAWN |  | 0 |
LETTERS OF CREDIT |  | 106,000,000 |
COMMERCIAL PAPER OUTSTANDING |  | 349,000,000 |
NET AVAILABLE |  | 3,151,000,000 |
Total non-committed credit facilities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
TOTAL AVAILABLE |  | 1,939,000,000 |
DRAWN |  | 0 |
LETTERS OF CREDIT |  | 1,082,000,000 |
COMMERCIAL PAPER OUTSTANDING |  | 0 |
NET AVAILABLE |  | 857,000,000 |
Total committed and non-committed credit facilities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
TOTAL AVAILABLE |  | 5,545,000,000 |
DRAWN |  | 0 |
LETTERS OF CREDIT |  | 1,188,000,000 |
COMMERCIAL PAPER OUTSTANDING |  | 349,000,000 |
NET AVAILABLE |  | 4,008,000,000 |
Unsecured revolving credit facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
TOTAL AVAILABLE |  | 2,500,000,000 |
Unsecured expansion facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
TOTAL AVAILABLE |  | $ 1,000,000,000 |

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