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Long-term debt - Summary of Long-Term Debt (Details) $ in Millions, $ in Millions | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Total long-term debt due within one year | $ (990) |  | $ (975) |
Total long-term debt | $ 27,048 |  | 23,906 |
1997 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 | 3.67% | 3.67% |  |
1976 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 | 9.38% | 9.38% |  |
2011 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 | 4.00% | 4.00% |  |
2016 U.S. trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 4,100 |  | $ 1,750
2016 U.S. trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 | 3.26% | 3.26% |  |
1996 trust indenture (subordinated) | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 | 8.21% | 8.21% |  |
Lease liabilities | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 | 4.13% | 4.13% |  |
Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | $ 28,160 |  | 24,970 |
Gross carrying amount | 1997 trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 16,750 |  | 16,400 |
Gross carrying amount | 1976 trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 975 |  | 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 | 5,188 |  | 2,228 |
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 | 4,309 |  | 4,356 |
Gross carrying amount | Other |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 438 |  | 386 |
Net unamortized discount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 26 |  | 19 |
Unamortized debt issuance costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | $ 96 |  | $ 70 |

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