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Financial assets and liabilities - Currency Exposures (Details) ₱ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 CAD ($) | Jun. 30, 2019 CAD ($) | Jun. 30, 2020 CAD ($) | Jun. 30, 2019 CAD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 PHP (₱)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives | $ (9,000,000) | $ 12,000,000 | $ (37,000,000) | $ 112,000,000 |  |
Credit Facility |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 2,035,000,000 |  | 2,035,000,000 |  | $ 1,450,000,000 |
Credit facilities | 4,000,000,000 |  | 4,000,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 2,035,000,000 |  | 2,035,000,000 |  | $ 1,450,000,000 |
Currency risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives | $ 30,000,000 |  | $ 14,000,000 |  |  |
Percentage of possible change in risk variable | 10.00% |  | 10.00% |  | 10.00% | 10.00%
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) | $ 2,000,000 |  | $ 2,000,000 |  |  |
Currency risk | 2020 | Cash flow | Commercial paper | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 200,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 200,000,000 |
Currency risk | 2020 | Cash flow | Commercial paper | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 279,000,000 |  | 279,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 279,000,000 |  | 279,000,000 |  |  |
Currency risk | 2020 | Cash flow | Credit Facility | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | 370,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 370,000,000 |
Currency risk | 2020 | Cash flow | Credit Facility | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 480,000,000 |  | 480,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 480,000,000 |  | 480,000,000 |  |  |
Currency risk | 2020 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | 588,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 588,000,000 |
Currency risk | 2020 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 768,000,000 |  | 768,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 768,000,000 |  | 768,000,000 |  |  |
Currency risk | 2020 | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | 60,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 60,000,000 |
Currency risk | 2020 | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 81,000,000 |  | 81,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 81,000,000 |  | 81,000,000 |  |  |
Currency risk | 2020 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | 209,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 209,000,000 |
Currency risk | 2020 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 284,000,000 |  | 284,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 284,000,000 |  | 284,000,000 |  |  |
Currency risk | 2020 | Economic - call options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 87,000,000 |  | 87,000,000 |  | 149,000,000 |
Financial instruments designated as hedging instruments, at fair value | 87,000,000 |  | 87,000,000 |  | 149,000,000 |
Currency risk | 2020 | Economic - call options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 201,000,000 |  | 201,000,000 |  | 60,000,000 |
Financial instruments designated as hedging instruments, at fair value | 201,000,000 |  | 201,000,000 |  | 60,000,000 |
Currency risk | 2020, Hedge Two | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | ₱ |  |  |  |  |  | ₱ 1,012
Financial instruments designated as hedging instruments, at fair value | ₱ |  |  |  |  |  | ₱ 1,012
Currency risk | 2020, Hedge Two | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 26,000,000 |  | 26,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 26,000,000 |  | 26,000,000 |  |  |
Currency risk | 2021 | Cash flow | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | 26,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 26,000,000 |
Currency risk | 2021 | Cash flow | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 36,000,000 |  | 36,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 36,000,000 |  | 36,000,000 |  |  |
Currency risk | 2021 | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | 120,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 120,000,000 |
Currency risk | 2021 | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 161,000,000 |  | 161,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 161,000,000 |  | 161,000,000 |  |  |
Currency risk | 2021 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | 214,000,000 |
Financial instruments designated as hedging instruments, at fair value |  |  |  |  | 214,000,000 |
Currency risk | 2021 | Economic - put options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 284,000,000 |  | 284,000,000 |  |  |
Financial instruments designated as hedging instruments, at fair value | 284,000,000 |  | 284,000,000 |  |  |
Currency risk | 2021 | Economic - call options | Economic | Anticipated transactions | AMOUNT TO RECEIVE |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 68,000,000 |  | 68,000,000 |  | 47,000,000 |
Financial instruments designated as hedging instruments, at fair value | 68,000,000 |  | 68,000,000 |  | 47,000,000 |
Currency risk | 2021 | Economic - call options | Economic | Anticipated transactions | AMOUNT TO PAY |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 65,000,000 |  | 65,000,000 |  | 47,000,000 |
Financial instruments designated as hedging instruments, at fair value | 65,000,000 |  | 65,000,000 |  | 47,000,000 |
Currency risk | Interest rate swap | Fair value hedge |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount | 2,039,000,000 |  | 2,039,000,000 |  | 1,453,000,000 |
Financial instruments designated as hedging instruments, at fair value | 2,039,000,000 |  | 2,039,000,000 |  | $ 1,453,000,000 |
Currency risk | Top of range |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 1,000,000 |  | 1,000,000 |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) | 228,000,000 |  | 228,000,000 |  |  |
Currency risk | Bottom of range |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 55,000,000 |  | 55,000,000 |  |  |
Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives | $ 3,000,000 |  | $ 5,000,000 |  |  |
Percentage of possible change in risk variable | 1.00% |  | 1.00% |  | 1.00% | 1.00%
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 | $ (31,000,000) |  | $ (31,000,000) |  |  |
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 | $ 38,000,000 |  | $ 38,000,000 |  |  |

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