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Long-term debt - Summary of long-term debt (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt due within one year | $ (1,106) | $ (1,307)
Long-term debt | $ 18,215 | 16,572
1997 trust indenture | Weighted Average |  |
Disclosure of detailed information about borrowings [line items] |  |
WEIGHTED AVERAGE INTEREST RATE | 3.86% |
1976 trust indenture | Weighted Average |  |
Disclosure of detailed information about borrowings [line items] |  |
WEIGHTED AVERAGE INTEREST RATE | 9.54% |
2011 trust indenture | Weighted Average |  |
Disclosure of detailed information about borrowings [line items] |  |
WEIGHTED AVERAGE INTEREST RATE | 4.28% |
2001 trust indenture | Weighted Average |  |
Disclosure of detailed information about borrowings [line items] |  |
WEIGHTED AVERAGE INTEREST RATE | 5.63% |
Subordinated debentures | Weighted Average |  |
Disclosure of detailed information about borrowings [line items] |  |
WEIGHTED AVERAGE INTEREST RATE | 8.21% |
Finance leases | Weighted Average |  |
Disclosure of detailed information about borrowings [line items] |  |
WEIGHTED AVERAGE INTEREST RATE | 6.64% |
Unsecured committed term credit facility | Weighted Average |  |
Disclosure of detailed information about borrowings [line items] |  |
WEIGHTED AVERAGE INTEREST RATE |  |
Gross carrying amount |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | $ 19,317 | 17,902
Gross carrying amount | 1997 trust indenture |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 14,950 | 13,600
Gross carrying amount | 1976 trust indenture |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 1,100 | 1,100
Gross carrying amount | 2011 trust indenture |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 425 | 0
Gross carrying amount | 2001 trust indenture |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 200 | 0
Gross carrying amount | Subordinated debentures |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 275 | 275
Gross carrying amount | Finance leases |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 2,172 | 2,260
Total long-term debt due within one year | (445) | (435)
Gross carrying amount | Unsecured committed term credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 0 | 479
Total long-term debt due within one year | 0 | (479)
Gross carrying amount | Other debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 195 | 188
Net unamortized premium |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | 50 | 18
Total long-term debt due within one year | 0 | (1)
Unamortized debt issuance costs |  |
Disclosure of detailed information about borrowings [line items] |  |
Total debt | (46) | (41)
Total long-term debt due within one year | $ 0 | $ (6)

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