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Changes in Accounting Policies - Narrative (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Interbank Offered Rate (IBOR) |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |
Non-derivative financial assets | $ 2,750 |  | $ 3,849
Non-derivative financial liabilities | 77 |  | 70
Total notional amount | 1,683 |  | $ 9,417
Canadian Dollar Offered Rate (CDOR) |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |
Non-derivative financial assets | 396 | $ 387 |
Non-derivative financial liabilities | 5,892 | 6,286 |
Total notional amount | $ 11,725 | $ 10,748 |

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