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Long-term debt - Narrative (Details) $ in Millions, $ in Millions |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2022 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Feb. 15, 2024 CAD ($) | Feb. 15, 2024 USD ($) | Nov. 14, 2023 CAD ($) | Aug. 11, 2023 CAD ($) | May 11, 2023 CAD ($) | May 11, 2023 USD ($) | Feb. 09, 2023 CAD ($) | Nov. 10, 2022 CAD ($) | Feb. 11, 2022 CAD ($) | Feb. 11, 2022 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Early debt redemption costs |  | $ 1 | $ 18 |  |  |  |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 300 |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.85% |  |  |  |  |  |  |
Series M-62 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 700 |  |  |  |  |  |  |
Series M-62 Medium Term Notes Debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.25% |  |  |  |  |  |  |
Series M-60 Medium Term Note Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 600 |  |  |  |  |  |
Series M-60 Medium Term Note Debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.15% |  |  |  |  |  |
Series M-61 Medium Term Note Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 400 |  |  |  |  |  |
Series M-61 Medium Term Note Debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.60% |  |  |  |  |  |
Series US-8 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 1,138 | $ 850 |  |  |  |
Series US-8 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.10% | 5.10% |  |  |  |
Series M-58 Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 1,050 |  |  |
Series M-58 Medium Term Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.55% |  |  |
Series M-59 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 450 |  |  |
Series M-59 Medium Term Notes Debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 5.15% |  |  |
Series M57 Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Series M57 Medium Term Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 5.85% |  |
Series M-26 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Early debt redemption costs | $ 18 |  |  |  |  |  |  |  |  |  |  |  |
Series M-26 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.35% |  |  |  |  |  |  |  |  |  |  |  |
Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 954 | $ 750
Series US-7 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 3.65% | 3.65%
Series US-9 Notes | Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 942 | $ 700 |  |  |  |  |  |  |  |
Series US-9 Notes | Fixed interest rate | Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.20% | 5.20% |  |  |  |  |  |  |  |
Series US-10 Notes | Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,009 | $ 750 |  |  |  |  |  |  |  |
Series US-10 Notes | Borrowings | Fair value hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 336 |  |  |  |  |  |  |  |  |
Series US-10 Notes | Fixed interest rate | Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.55% | 5.55% |  |  |  |  |  |  |  |

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