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Financial assets and liabilities - Interest Rate Exposures (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives | $ (9) | $ 12 | $ (37) | $ 112 |  |
Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives | $ 3 |  | $ 5 |  |  |
Percentage of possible change in risk variable | 1.00% |  | 1.00% |  |  |
Settlement of share-based compensation plans | Forward contract | Net asset value | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 5 |  | $ 5 |  |  |
Preferred shares |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Value of shares | $ 4,004 |  | $ 4,004 |  |  | $ 4,004
Preferred shares | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Value of shares |  |  |  |  | $ 582 |

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