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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 | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 PHP (₱) | Dec. 31, 2021 USD ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Early debt redemption costs | $ (18) | $ (53) |  |  |
Net gains (losses) on change in fair value of derivatives | (53) | 278 |  |  |
Preferred shares |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Value of shares | $ 3,870 | 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 2023 | Cash flow hedges | Loans | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount |  |  | $ 1,178 |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Loans | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 1,607 |  |  |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Commercial paper | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount |  |  | 632 |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Commercial paper | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 852 |  |  |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount |  |  | 796 |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive | Purchased call options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount |  |  | 156 |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 989 |  |  |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay | Purchased call options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 196 |  |  |  |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | ₱ |  |  |  | ₱ 2,147 |
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 50 |  |  |  |
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount |  |  | 225 |  |
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 |  |  | 156 |  |
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 156 |  |  |  |
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 | 196 |  |  |  |
Currency risk | Maturing in 2024 | Cash flow hedges | Anticipated Transactions | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount |  |  | 643 |  |
Currency risk | Maturing in 2024 | Cash flow hedges | Anticipated Transactions | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 810 |  |  |  |
Currency risk | Maturing in 2024 | Economic | Anticipated Transactions | Amount to receive | Purchased call options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 225 |  | 156 |  |
Currency risk | Maturing in 2024 | 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 2024 | Economic | Anticipated Transactions | Amount to pay | Purchased call options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 195 |  | $ 156 |  |
Currency risk | Maturing in 2024 | Economic | Anticipated Transactions | Amount to pay | Written put options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | $ 153 |  |  |  |
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 | $ (53) | 278 |  |  |
Percentage of possible change in risk variable | 5.00% |  | 5.00% | 5.00% |
Reasonably possible change in risk variable impact on net earnings | $ 33 |  |  |  |
Top of range | Currency risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 10 |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income | 114 |  |  |  |
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 | 23 |  |  |  |
Bottom of range | Currency risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | (17) |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income | (105) |  |  |  |
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 | (24) |  |  |  |
Interest rate swap contract | Currency risk | Fair value hedges |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 954 | 4,511 | $ 750 |  | $ 3,500
Interest rate swap contract | Interest rate risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 500 | 748 |  |  | $ 600
Early debt redemption costs | 7 |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 14 |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-53 MTN debentures |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 1,000 |  |  |  |
Proceeds from sale of financial assets | 9 |  |  |  |
Interest rate swap contract | Interest rate risk | Maturing in 2023 |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 638 |  |  |  |
Financial liabilities, at fair value | 33 |  |  |  |
Interest rate swap contract | Interest rate risk | Maturing in 2027 | Series M-53 MTN debentures |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount | 500 |  |  |  |
Currency Basis Rate Swap Contract |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | $ 9 |  |  |  |
Currency Basis Rate Swap Contract | Cross currency basis swap rate risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Percentage of possible change in risk variable | 0.10% |  | 0.10% | 0.10% |
Forward contract | Equity price risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 48 | 130 |  |  |
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 | 1 | 15 |  |  |
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 | $ 1 | 2 |  |  |
Swap contract | Currency risk | Fair value hedges |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Notional amount |  | $ 127 |  |  |

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