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Risk Management - Summary of Potential Impacts on Contractual Service Margin, Net Income Attributed to Shareholders, Other Comprehensive Income Attributed to Shareholders, and Total Comprehensive Income Attributed to Shareholders of an Immediate Parallel Change in Interest Rates, Corporate Spreads or Swap Spreads Relative to Current Rates (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
-50bp [member] |  |
Disclosure of Detailed Information about Potential Impacts Due To Interest Rates Corporate Spreads or Swap Spreads Relative to Current Rates [Line Items] |  |
Interest rates, CSM | $ 0 | $ (100)
Interest rates, Net income attributed to shareholders | 100 | 1,700
Interest rates, Other comprehensive income attributed to shareholders | (300) | (1,900)
Interest rates, Total comprehensive income attributed to shareholders | (200) | (200)
Corporate spreads, CSM | 0 | (100)
Corporate spreads, Net income attributed to shareholders | 0 |
Corporate spreads, Other comprehensive income attributed to shareholders | (200) |
Corporate spreads, Total comprehensive income attributed to shareholders | (200) |
+50bp [member] |  |
Disclosure of Detailed Information about Potential Impacts Due To Interest Rates Corporate Spreads or Swap Spreads Relative to Current Rates [Line Items] |  |
Interest rates, CSM | (100) |
Interest rates, Net income attributed to shareholders | (100) | (1,500)
Interest rates, Other comprehensive income attributed to shareholders | 300 | 1,600
Interest rates, Total comprehensive income attributed to shareholders | 200 | 100
Corporate spreads, CSM | (100) |
Corporate spreads, Net income attributed to shareholders | 0 |
Corporate spreads, Other comprehensive income attributed to shareholders | 300 |
Corporate spreads, Total comprehensive income attributed to shareholders | 300 |
-20bp [member] |  |
Disclosure of Detailed Information about Potential Impacts Due To Interest Rates Corporate Spreads or Swap Spreads Relative to Current Rates [Line Items] |  |
Swap spreads, CSM | 0 |
Swap spreads, Net income attributed to shareholders | 100 | 0
Swap spreads, Other comprehensive income attributed to shareholders | (100) | 0
Swap spreads, Total comprehensive income attributed to shareholders | 0 |
+20bp [member] |  |
Disclosure of Detailed Information about Potential Impacts Due To Interest Rates Corporate Spreads or Swap Spreads Relative to Current Rates [Line Items] |  |
Swap spreads, CSM | 0 |
Swap spreads, Net income attributed to shareholders | (100) | 0
Swap spreads, Other comprehensive income attributed to shareholders | 100 | $ 0
Swap spreads, Total comprehensive income attributed to shareholders | $ 0 |

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