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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, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 PHP (₱) | Jun. 30, 2021 USD ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | $ 278 | $ (51) |  |  |
Preferred shares |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Value of shares |  | $ 4,003 | 4,003 |  |  |
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 |  | $ 4 |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Commercial paper | Amount to receive |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  |  |  | $ 561 |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Commercial paper | Amount to pay |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 721 |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount | ₱ |  |  |  |  | ₱ 2,270 |
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 |  |  |  | 212 |  |
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 |  |  |  | 212 |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 58 |  |  |  |
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 |  | 275 |  |  |  |
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 |  | 272 |  |  |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  |  |  | 568 |  |
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 723 |  |  |  |
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  |  |  | 40 |  |
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive | Purchased call options |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 190 |  | 150 |  |
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive | Written put options |  |  |  |  |  |
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 |  | 50 |  |  |  |
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to pay | Purchased call options |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 178 |  | 150 |  |
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to pay | Written put options |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 123 |  |  |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  |  |  | 550 |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 678 |  |  |  |
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to receive | Written put options |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  |  |  | $ 240 |  |
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to pay | Written put options |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | $ 290 |  |  |  |
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 | 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 |  | $ (278) | 51 |  |  |
Percentage of possible change in risk variable |  | 5.00% |  | 5.00% | 5.00% |
Reasonably possible change in risk variable impact on net earnings |  | $ 43 |  |  |  |
Commodity price risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | 6 | 3 |  |  |
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 |  | 241 |  |  |  |
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 |  | 3 |  |  |  |
Reasonably possible change in risk variable impact on other comprehensive income |  | 18 |  |  |  |
Bottom of range | Currency risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | (20) |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income |  | (221) |  |  |  |
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 |  | (4) |  |  |  |
Reasonably possible change in risk variable impact on other comprehensive income |  | (25) |  |  |  |
Interest rate swap contract | Currency risk | Fair value hedges |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 4,511 |  | $ 3,500 |  |
Interest rate swap contract | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 748 |  | $ 600 |  |
Forward contract | Currency risk | Fair value hedges |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount | $ 2,039 |  |  |  |  | $ 1,453
Net gains (losses) on change in fair value of derivatives | $ (14) |  |  |  |  |
Forward contract | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 127 |  |  |  |
Forward contract | Equity price risk | Purchase Cost of Fuel |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 130 | 82 |  |  |
Currency swap contract | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional amount |  | 127 |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | 1 |  |  |  |
Currency swap contract | Interest rate risk | Net asset value |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 1 |  |  |  |
Interest Rate Options | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives |  | 15 | 6 |  |  |
Interest Rate Options | Interest rate risk | Dividend rate reset of preference shares |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | $ 2 | $ 6 |  |  |

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