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Financial and capital management - Market Risk Narrative (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Nov. 14, 2023 CAD ($) | Aug. 11, 2023 CAD ($) | May 11, 2023 CAD ($) | May 11, 2023 USD ($) | Feb. 09, 2023 CAD ($) | Dec. 31, 2022 USD ($) | Feb. 11, 2022 CAD ($) | Feb. 11, 2022 USD ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Early debt redemption costs | $ (1) |  | $ (18) |  |  |  |  |  |  |  |  |  |
Net mark-to-market losses on derivatives used to economically hedge equity settled share-based compensation plans | (103) |  | (53) |  |  |  |  |  |  |  |  |  |
Preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
STATED CAPITAL | $ 3,667 |  | 3,870 |  |  |  |  |  |  |  |  |  |
Series US-8 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 1,138 | $ 850 |  |  |  |
Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 954 | $ 750
Series M-62 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 700 |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 300 |  |  |  |  |  |  |
Series M-59 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 450 |  |  |
Series M-61 Medium Term Note Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 400 |  |  |  |  |  |
Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of possible change in risk variable | 10.00% |  |  |  | 10.00% |  |  |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity | $ 5 |  |  |  |  |  |  |  |  |  |  |  |
Currency risk | Series US-8 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
FAIR VALUE | 37 |  |  |  |  |  |  |  |  |  |  |  |
Currency risk | Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
FAIR VALUE | 132 |  | 46 |  |  |  |  |  |  |  |  |  |
Currency risk | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 28 |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity | 124 |  |  |  |  |  |  |  |  |  |  |  |
Currency risk | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | (100) |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity | $ (123) |  |  |  |  |  |  |  |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of possible change in risk variable | 1.00% |  |  |  | 1.00% |  |  |  |  |  |  |  |
Interest rate risk | Preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
STATED CAPITAL |  |  | 582 |  |  |  |  |  |  |  |  |  |
Interest rate risk | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | $ 26 |  |  |  |  |  |  |  |  |  |  |  |
Equity price risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of possible change in risk variable | 5.00% |  |  |  | 5.00% |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | $ 29 |  |  |  |  |  |  |  |  |  |  |  |
Net mark-to-market losses on derivatives used to economically hedge equity settled share-based compensation plans | (103) |  | 53 |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Currency risk | Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 127 |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Currency risk | Maturing in 2033 | Series US-8 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 1,138 |  |  |  | $ 850 |  |  |  |  |  |  |  |
Interest rate swap contract | Currency risk | Maturing in 2052 | Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 954 |  |  |  |  |  |  |  | $ 750 |  |
Interest rate swap contract | Interest rate risk | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, swaptions unexercised |  |  | 500 |  |  |  |  |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 4 |  | 14 |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-52 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 125 |  |  |  |  |  |  |  |  |  |  |  |
Financial assets, at fair value | 12 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-57 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 375 |  |  |  |  |  |  |  |  |  |  |  |
Financial assets, at fair value | 24 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Maturing in 2027 | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 125 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Maturing in 2030 | Series M-52 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 375 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Maturing in 2032 | Series M-57 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 125 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract | Fair value hedges | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 491 |  |  |  | 360 |  |  |  |  |  |  |  |
Financial assets, at fair value | 15 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaptions | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 250 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaptions | Interest rate risk | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 425 |  | 1,000 |  |  |  |  |  |  |  |  |  |
Notional amount, swaptions exercised |  |  | 500 |  |  |  |  |  |  |  |  |  |
Early debt redemption costs | 4 |  | (7) |  |  |  |  |  |  |  |  |  |
Interest Rate Swaptions | Interest rate risk | Series M-52 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 375 |  |  |  |  |  |  |  |  |  |  |  |
Early debt redemption costs | 1 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaptions | Interest rate risk | Series M-57 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 125 |  |  |  |  |  |  |  |  |  |  |  |
Early debt redemption costs | 2 |  |  |  |  |  |  |  |  |  |  |  |
Forward Starting Interest Rate Swap | Maturing in 2029 | Series M-62 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 700 |  |  |  |  |  |  |  |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk | Series M-62 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets, at fair value | 22 |  |  |  |  |  |  |  |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk | Series M-61 Medium Term Note Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets, at fair value | 48 |  |  |  |  |  |  |  |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053 | Series M-59 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 125 |  |  |  |  |  |  |  |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053 | Series M-61 Medium Term Note Debentures |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 400 |  |  |  |  |  |  |  |  |  |  |  |
Amortizing Interest Rate Swap | Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
FAIR VALUE | 2 |  |  |  |  |  |  |  |  |  |  |  |
Amortizing Interest Rate Swap | Interest rate risk | Maturing in 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 197 |  |  |  |  |  |  |  |  |  |  |  |
Currency Basis Rate Swap Contract | Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
FAIR VALUE |  |  | 33 |  | $ 13 |  |  |  |  |  |  |  |
Percentage of possible change in risk variable | 0.10% |  |  |  | 0.10% |  |  |  |  |  |  |  |
Net mark-to-market losses on derivatives used to economically hedge equity settled share-based compensation plans |  | $ 20 |  | $ (33) |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | $ 11 |  |  |  |  |  |  |  |  |  |  |  |
Currency Basis Rate Swap Contract | Interest rate risk | Maturing in 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 638 |  |  |  |  |  |  |  |  |  |
Currency Basis Rate Swap Contract | Interest rate risk | Maturing in 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 644 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Options | Interest rate risk | Dividend rate reset of preference shares |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 0 |  | 1 |  |  |  |  |  |  |  |  |  |
Forward contract | Equity price risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 162 |  | $ 48 |  |  |  |  |  |  |  |  |  |

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