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Long-term debt - Summary of Long-Term Debt (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2017 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total long-term debt due within one year | $ (525) | $ (1,106) |  |  | $ (1,307)
Total long-term debt | 19,760 | 18,215 |  |  | 16,572
Repayments of non-current borrowings | $ 2,713 | 2,653 |  |  |
1997 trust indenture | Weighted Average |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 3.85% |  |  | 3.85% |
1976 trust indenture | Weighted Average |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 9.54% |  |  | 9.54% |
2011 trust indenture | Weighted Average |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 4.00% |  |  | 4.00% |
2016 U.S. trust indenture |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Notional amount | $ 1,493 |  |  | $ 1,150,000,000 |
2016 U.S. trust indenture | Weighted Average |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 4.46% |  |  | 4.46% |
1996 trust indenture (subordinated) | Weighted Average |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 8.21% |  |  | 8.21% |
Finance leases | Weighted Average |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 6.67% |  |  | 6.67% |
Unsecured committed term credit facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Repayments of non-current borrowings |  | 480 | $ 357,000,000 |  |
Gross carrying amount |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | $ 20,324 | 19,317 |  |  | 17,902
Gross carrying amount | 1997 trust indenture |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 14,750 | 14,950 |  |  | 13,600
Gross carrying amount | 1976 trust indenture |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 1,100 | 1,100 |  |  | 1,100
Gross carrying amount | 2011 trust indenture |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 225 | 425 |  |  | 0
Gross carrying amount | 2001 trust indenture |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 0 | 200 |  |  | 0
Gross carrying amount | 2016 U.S. trust indenture |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 1,569 | 0 |  |  | 0
Gross carrying amount | 1996 trust indenture (subordinated) |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 275 | 275 |  |  | 275
Gross carrying amount | Finance leases |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 2,097 | 2,172 |  |  | 2,260
Total long-term debt due within one year | (466) | (445) |  |  | (435)
Gross carrying amount | Unsecured committed term credit facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 0 | 0 |  |  | 479
Total long-term debt due within one year | 0 | 0 |  |  | (479)
Gross carrying amount | Other |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 308 | 195 |  |  | 188
Net unamortized premium |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | (21) | (50) |  |  | (18)
Total long-term debt due within one year | 0 | 0 |  |  | (1)
Unamortized debt issuance costs |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total debt | 60 | 46 |  |  | 41
Total long-term debt due within one year | $ 0 | $ 0 |  |  | $ (6)

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