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Financial assets and liabilities - Currency Exposures Narrative (Details) - Currency risk $ in Millions, $ in Millions | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CAD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 CAD ($)
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Disclosure of detailed information about hedges [line items] |  |  |  |
Percentage of possible change in risk variable | 10.00% | 10.00% |  |
Series A Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, liabilities |  | $ 79 |  |
Interest rate swap |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, liabilities |  | 6 |  |
Hedging instrument, assets |  | 4 |  |
Initial net financial liabilities, at fair value |  | 55 |  |
Interest rate swap | Maturing in 2025 and 2026 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount, financial instrument terminated | $ 600 | 814 |  |
Interest rate swap | Series US-2 Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount, financial instrument terminated | 174 | 235 |  |
Interest rate swap | Series US-4 Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount, financial instrument terminated | 79 | 100 |  |
Interest rate swap | Series US-5 Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount, financial instrument terminated | 183 | 230 |  |
Interest rate swap | Series US-6 Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount, financial instrument terminated | 191 | 241 |  |
Interest rate swap | Series US-7 Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount, financial instrument terminated | 217 | 276 |  |
Interest rate swap | Series A Notes | Maturing In 2030 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount | 628 | 942 |  |
Interest rate swap | Series B Notes Maturing in 2055 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, liabilities |  | 78 |  |
Interest rate swap | Series B Notes Maturing in 2055 | Maturing In 2035 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount | 878 | 1,288 |  |
Interest rate swap | Fair value hedge |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, liabilities |  | 110 |  |
Interest rate swap | Fair value hedge | Maturing In 2029 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount | 228 | 315 |  |
Interest rate swap | Fair value hedge | Series A Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, liabilities |  | 55 |  |
Foreign Exchange Swaps |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount | 372 | 524 |  |
Hedging instrument, liabilities |  | 20 |  |
Initial net financial liabilities, at fair value |  | 14 |  |
Foreign Exchange Swaps | 2025 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, assets |  | 13 |  |
Foreign Exchange Swaps | Series A Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount | 372 | 520 |  |
Hedging instrument, liabilities |  |  |  | $ 3
Initial net financial liabilities, at fair value |  |  |  | 8
Foreign Exchange Swaps | Series A Notes | 2025 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount |  |  | $ 1,000 | 1,398
Notional amount, financial instrument terminated |  |  | $ 628 | $ 878
Foreign Exchange Swaps | Series B Notes Maturing in 2055 | 2025 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount | 1,250 | 1,769 |  |
Foreign Exchange Swaps | Series B Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, liabilities |  | 24 |  |
Notional amount, financial instrument terminated | 456 | 643 |  |
Foreign Exchange Swaps | Series B Notes | 2025 |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Notional amount | $ 828 | 1,167 |  |
Foreign Exchange Swaps | Fair value hedge | Series A Notes |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Hedging instrument, liabilities |  | 16 |  |
Initial net financial liabilities, at fair value |  | 8 |  |
Top of range |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact in net earnings |  | 133 |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) |  | 238 |  |
Bottom of range |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact in net earnings |  | (269) |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) |  | $ (227) |  |

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