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Long-term debt - Summary of Long-Term Debt (Details) $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Total long-term debt due within one year | $ (975) |  | $ (837) |
Total long-term debt | $ 23,906 |  | 22,415 |
1997 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 3.68% | 3.68% |  |
1976 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 9.54% | 9.54% |  |
2011 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 4.00% | 4.00% |  |
2016 U.S. trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 1,750,000,000 |  | $ 1,750,000,000
2016 U.S. trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 4.41% | 4.41% |  |
1996 trust indenture (subordinated) | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 8.21% | 8.21% |  |
Lease liabilities | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 4.91% | 4.91% |  |
Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | $ 24,970 |  | 23,300 |
Gross carrying amount | 1997 trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 16,400 |  | 14,500 |
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 | 225 |  | 225 |
Gross carrying amount | 2016 U.S. trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 2,228 |  | 2,273 |
Gross carrying amount | 1996 trust indenture (subordinated) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 275 |  | 275 |
Gross carrying amount | Lease liabilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 4,356 |  | 4,599 |
Gross carrying amount | Other |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 386 |  | 328 |
Net unamortized (discount) premium |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 19 |  | (15) |
Unamortized debt issuance costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | $ 70 |  | $ 63 |

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