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Commitments and Contingencies - Summary of Condensed Consolidated Statements of Income Information for MFC and MFLP (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Condensed Income Statements, Captions [Line Items]    
Total revenue $ 17,147 $ 61,821
Net income (loss) attributed to shareholders 7,294 7,105
MFC [Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue 518 563
Net income (loss) attributed to shareholders 7,294 7,105
Other subsidiaries of MFC on a combined basis [Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue 17,732 62,323
Net income (loss) attributed to shareholders 7,071 6,842
Consolidating adjustments [Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue (1,103) (1,065)
Net income (loss) attributed to shareholders (7,071) (6,842)
Manulife Finance (Delaware), L.P.[Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue 64 41
Net income (loss) attributed to shareholders $ 21 $ 3