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Risk Management - Potential Impacts on Interest Rates, Corporate Spreads or Swap Spreads Relative to Current Rates (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
-50bp |  |
Disclosure of credit risk exposure [line items] |  |
Interest rates, CSM | $ 100 | $ 0
Interest rates, net income attributed to shareholders | 100 | 100
Interest rates, other comprehensive income attributed to shareholders | (100) | (300)
Interest rates, total comprehensive income attributed to shareholders | 0 | (200)
Corporate spreads, CSM | 0 | 0
Corporate spreads, net income attributed to shareholders | 100 | 0
Corporate spreads, other comprehensive income attributed to shareholders | (200) | (200)
Corporate spreads, total comprehensive income attributed to shareholders | (100) | (200)
+50bp |  |
Disclosure of credit risk exposure [line items] |  |
Interest rates, CSM | (200) | (100)
Interest rates, net income attributed to shareholders | (100) | (100)
Interest rates, other comprehensive income attributed to shareholders | 200 | 300
Interest rates, total comprehensive income attributed to shareholders | 100 | 200
Corporate spreads, CSM | (100) | (100)
Corporate spreads, net income attributed to shareholders | (100) | 0
Corporate spreads, other comprehensive income attributed to shareholders | 300 | 300
Corporate spreads, total comprehensive income attributed to shareholders | 200 | 300
-20bp |  |
Disclosure of credit risk exposure [line items] |  |
Swap spreads, CSM | 0 | 0
Swap spreads, net income attributed to shareholders | 100 | 100
Swap spreads, other comprehensive income attributed to shareholders | (100) | (100)
Swap spreads, total comprehensive income attributed to shareholders | 0 | 0
+20bp |  |
Disclosure of credit risk exposure [line items] |  |
Swap spreads, CSM | 0 | 0
Swap spreads, net income attributed to shareholders | (100) | (100)
Swap spreads, other comprehensive income attributed to shareholders | 100 | 100
Swap spreads, total comprehensive income attributed to shareholders | $ 0 | $ 0

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