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Risk Management - Summary of Potential Immediate Impacts on Contractual Service Margin, Net Income Attributed to Shareholders, Other Comprehensive Income Attributed to Shareholders, and Total Comprehensive Income Attributed to Shareholders from Changes in ALDA Market Values (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
-10% [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
CSM excluding NCI $ (100) $ (100)
Net income attributed to shareholders (2,400) (2,500)
Other comprehensive income attributed to shareholders (200) (100)
Total comprehensive income attributed to shareholders (2,600) (2,600)
+10% [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
CSM excluding NCI 100 100
Net income attributed to shareholders 2,400 2,500
Other comprehensive income attributed to shareholders 200 100
Total comprehensive income attributed to shareholders $ 2,600 $ 2,600