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Financial assets and liabilities - Currency Exposures (Details) ₱ in Millions, $ in Millions, $ in Millions | Jun. 30, 2019 CAD ($) | Jun. 30, 2019 PHP (₱) | Jun. 30, 2019 USD ($)
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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) | $ 3 |  |
Currency risk | 2019 | Cash flow | Commercial paper | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | $ 2,960
Currency risk | 2019 | Cash flow | Commercial paper | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 3,942 |  |
Currency risk | 2019 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | ₱ |  | ₱ 892 |
Currency risk | 2019 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 22 |  |
Currency risk | 2019 | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 60
Currency risk | 2019 | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 77 |  |
Currency risk | 2019 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 45
Currency risk | 2019 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 56 |  |
Currency risk | 2019, Hedge Two | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 419
Currency risk | 2019, Hedge Two | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 520 |  |
Currency risk | 2020 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 762
Currency risk | 2020 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 991 |  |
Currency risk | 2020 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 81
Currency risk | 2020 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 101 |  |
Currency risk | 2020 | Economic - call options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 48
Currency risk | 2020 | Economic - call options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 60 |  |
Currency risk | 2020, Hedge Two | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | ₱ |  | ₱ 932 |
Currency risk | 2020, Hedge Two | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 23 |  |
Currency risk | 2021 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | $ 40
Currency risk | 2021 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 50 |  |
Currency risk | Top of range |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reasonably possible change in risk variable impact on net earnings | 8 |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) | 186 |  |
Currency risk | Bottom of range |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reasonably possible change in risk variable impact on net earnings | 2 |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) | $ 174 |  |
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%
Reasonably possible change in risk variable impact on net earnings | $ (36) |  |
Interest rate risk | Interest rate swap | Fair value hedge |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 808 |  | $ 600

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