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IFRS 7 Disclosures - Summary of Potential Impact on Net Income Attributed to Shareholders and MLI's LICAT Ratio of an Immediate Parallel Change in Interest Rates (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
-50bp [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Excluding change in market value of AFS fixed income assets held in the Corporate and Other segment | $ (100) | $ (200)
From fair value changes in AFS fixed income assets held in the Corporate and Other segment, if realized | 1,500 | 2,100
+50bp [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Excluding change in market value of AFS fixed income assets held in the Corporate and Other segment | 100 |
From fair value changes in AFS fixed income assets held in the Corporate and Other segment, if realized | $ (1,400) | $ (1,900)

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