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Financial and capital management - Details on Outstanding Foreign Currency Forward Contracts and Cross Currency Basis Swaps (Details) ₱ in Millions, $ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 PHP (₱) | Sep. 30, 2020 CAD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | $ (51) | $ 138 |  |  |  |  |
Preferred shares |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Value of shares |  | 4,003 | 4,004 |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount | $ 2,035 |  |  |  |  |  | $ 1,450 |
Interest rate risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | $ 6 |  |  |  |  |  |
Percentage of possible change in risk variable |  | 1.00% |  | 1.00% | 1.00% |  |  |
Interest rate risk | Preferred shares |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Value of shares |  |  |  |  |  | $ 582 |  |
Equity price risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | $ (51) | 138 |  |  |  |  |
Percentage of possible change in risk variable |  | 5.00% |  | 5.00% | 5.00% |  |  |
Reasonably possible change in risk variable impact on net earnings |  | $ 39 |  |  |  |  |  |
Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives | (14) |  |  |  |  |  |  |
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 |  | $ 4 |  |  |  |  |  |
Currency risk | Maturing in 2021 | Cash flow hedges | Commercial Paper | Amount to receive |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 274 |  |  |  |
Currency risk | Maturing in 2021 | Cash flow hedges | Commercial Paper | Amount to pay |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 349 |  |  |  |  |  |
Currency risk | Maturing in 2021 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 675 | ₱ 2,174 |  |  |
Currency risk | Maturing in 2021 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 885 |  |  |  |  |  |
Currency risk | Maturing in 2021 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 59 |  |  |  |  |  |
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to receive |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 130 |  |  |  |
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to receive | Purchased call options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 17 |  | 12 |  |  |  |
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to receive | Written put options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 120 |  |  |  |
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to pay |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 180 |  |  |  |  |  |
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to pay | Purchased call options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 17 |  | 12 |  |  |  |
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to pay | Written put options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 154 |  |  |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 479 |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive | Purchased call options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 231 |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive | Written put options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 231 |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 614 |  |  |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay | Purchased call options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 299 |  |  |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay | Written put options |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 295 |  |  |  |  |  |
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 99 |  |  |  |
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to pay |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 123 |  |  |  |  |  |
Commodity price risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | $ 3 |  |  |  |  |  |
Percentage of possible change in risk variable |  | 25.00% |  | 25.00% | 25.00% |  |  |
Reasonably possible change in risk variable impact on net earnings |  | $ 3 |  |  |  |  |  |
Top of range | Interest rate risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | 20 |  |  |  |  |  |
Top of range | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | 7 |  |  |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income |  | 245 |  |  |  |  |  |
Bottom of range | Interest rate risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | (26) |  |  |  |  |  |
Bottom of range | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | (19) |  |  |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income |  | (215) |  |  |  |  |  |
Interest rate swap contract | Interest rate risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | (9) | 8 |  |  |  |  |
Interest rate swap contract | Interest rate risk | Fair value hedges |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 2,301 |  |  |  |  | $ 1,750
Interest rate swap contract | Currency risk | Fair value hedges |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount | $ 2,039 |  |  |  |  |  | $ 1,453 | $ 275
Forward contract | Interest rate risk | Settlement of share-based compensation plans | Net asset value |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 6 |  |  |  |  |  |
Forward contract | Equity price risk | Settlement of share-based compensation plans |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 82 | $ 40 |  |  |  |  |
Swap contract | Commodity price risk | Settlement of share-based compensation plans | Net asset value |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | $ 3 |  |  |  |  |  |

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