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Changes in Accounting Policies - Impairment of Financial Assets (Details)
$ in Millions
Dec. 31, 2022
CAD ($)
Disclosure of financial assets affected by amendments to IFRS 9 made by IFRS 17 [line items]  
Expected credit losses, carrying amount before IFRS 9 $ 192
Remeasurement (117)
Expected credit losses, carrying amount after IFRS 9 75
Financial assets, transfer from available-for-sale to fair value through other comprehensive income | Debt securities  
Disclosure of financial assets affected by amendments to IFRS 9 made by IFRS 17 [line items]  
Expected credit losses, carrying amount before IFRS 9 0
Remeasurement 15
Expected credit losses, carrying amount after IFRS 9 15
Financial assets, transfer from fair value through profit or loss to fair value through other comprehensive income | Debt securities  
Disclosure of financial assets affected by amendments to IFRS 9 made by IFRS 17 [line items]  
Expected credit losses, carrying amount before IFRS 9 0
Remeasurement 17
Expected credit losses, carrying amount after IFRS 9 17
Financial assets, transfer from loans and receivables to fair value through profit or loss | Mortgages and loans  
Disclosure of financial assets affected by amendments to IFRS 9 made by IFRS 17 [line items]  
Expected credit losses, carrying amount before IFRS 9 151
Remeasurement (151)
Expected credit losses, carrying amount after IFRS 9 0
Financial assets, transfer from loans and receivables to fair value through other comprehensive income | Mortgages and loans  
Disclosure of financial assets affected by amendments to IFRS 9 made by IFRS 17 [line items]  
Expected credit losses, carrying amount before IFRS 9 33
Remeasurement 1
Expected credit losses, carrying amount after IFRS 9 34
Financial assets, transfer from loans and receivables to amortised cost | Mortgages and loans  
Disclosure of financial assets affected by amendments to IFRS 9 made by IFRS 17 [line items]  
Expected credit losses, carrying amount before IFRS 9 8
Remeasurement 1
Expected credit losses, carrying amount after IFRS 9 $ 9