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Risk Management - Potential Immediate Impacts Total Comprehensive Income Attributed to Shareholders from Changes in ALDA Market Values (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
-10%    
Disclosure of credit risk exposure [line items]    
CSM excluding NCI $ (200) $ (100)
Net income attributed to shareholders (2,500) (2,400)
Other comprehensive income attributed to shareholders (200) (200)
Other comprehensive income attributed to shareholders (2,700) (2,600)
+10%    
Disclosure of credit risk exposure [line items]    
CSM excluding NCI 200 100
Net income attributed to shareholders 2,500 2,400
Other comprehensive income attributed to shareholders 200 200
Other comprehensive income attributed to shareholders $ 2,700 $ 2,600