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Financial assets and liabilities - Currency Exposures (Details) ₱ in Millions, $ in Millions, $ in Millions | Jun. 30, 2022 USD ($) | Jun. 30, 2022 CAD ($) | Jun. 30, 2022 PHP (₱) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 CAD ($)
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Interest rate risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Percentage of possible change in risk variable | 1.00% | 1.00% | 1.00% |  |
Interest rate risk | Series US-3 Notes |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  |  |  | $ 750 | $ 954
Financial instruments designated as hedging instruments, at fair value |  |  |  | $ 750 | $ 954
Interest rate risk | Top of range |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | $ 28 |  |  |
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 |  | $ 40 |  |  |
Currency risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Percentage of possible change in risk variable | 10.00% | 10.00% | 10.00% |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) |  | $ 6 |  |  |
Currency risk | 2022 | Cash flow | Commercial paper | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | $ 1,095 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 1,095 |  |  |  |
Currency risk | 2022 | Cash flow | Commercial paper | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 1,390 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 1,390 |  |  |
Currency risk | 2022 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 291 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 291 |  |  |  |
Currency risk | 2022 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 370 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 370 |  |  |
Currency risk | 2022 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | ₱ |  |  | ₱ 1,174 |  |
Financial instruments designated as hedging instruments, at fair value | ₱ |  |  | 1,174 |  |
Currency risk | 2022 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 28 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 28 |  |  |
Currency risk | 2022 | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 12 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 12 |  |  |  |
Currency risk | 2022 | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 15 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 15 |  |  |
Currency risk | 2022 | Call options | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 100 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 100 |  |  |  |
Currency risk | 2022 | Call options | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 129 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 129 |  |  |
Currency risk | 2022 | Call options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 75 | 95 |  |  |
Financial instruments designated as hedging instruments, at fair value | 75 | 95 |  |  |
Currency risk | 2022 | Call options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 75 | 89 |  |  |
Financial instruments designated as hedging instruments, at fair value | 75 | 89 |  |  |
Currency risk | 2022 | Put options | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 100 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 100 |  |  |  |
Currency risk | 2022 | Put options | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 127 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 127 |  |  |
Currency risk | 2022 | Put options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 120 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 120 |  |  |  |
Currency risk | 2022 | Put options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 147 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 147 |  |  |
Currency risk | 2022 | Options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 90 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 90 |  |  |  |
Currency risk | 2022 | Options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 109 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 109 |  |  |
Currency risk | 2023 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | ₱ |  |  | 2,147 |  |
Financial instruments designated as hedging instruments, at fair value | ₱ |  |  | ₱ 2,147 |  |
Currency risk | 2023 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 50 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 50 |  |  |
Currency risk | 2023 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 611 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 611 |  |  |  |
Currency risk | 2023 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 752 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 752 |  |  |
Currency risk | 2023 | Options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 169 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 169 |  |  |  |
Currency risk | 2023 | Options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 205 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 205 |  |  |
Currency risk | 2024 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 254 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 254 |  |  |  |
Currency risk | 2024 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 317 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 317 |  |  |
Currency risk | 2024 | Call options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount | 120 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 120 |  |  |  |
Currency risk | 2024 | Call options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Principal amount |  | 146 |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 146 |  |  |
Currency risk | Top of range |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | 13 |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) |  | 138 |  |  |
Currency risk | Bottom of range |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | 21 |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) |  | $ 119 |  |  |

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