Financial assets and liabilities - Currency Exposures (Details) ₱ in Millions, $ in Millions, $ in Millions | Jun. 30, 2019CAD ($) | Jun. 30, 2019PHP (₱) | Jun. 30, 2019USD ($) |
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 |