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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, 2023
Dec. 31, 2022
Condensed Income Statements, Captions [Line Items]    
Insurance service result $ 3,977 $ 3,160
Investment result 2,958 (6,369)
Other revenue 6,746 6,186
Net income (loss) attributed to shareholders and other equity holders 5,103 (1,933)
MFC [Member]    
Condensed Income Statements, Captions [Line Items]    
Insurance service result 0  
Investment result 638 554
Other revenue 14 (36)
Net income (loss) attributed to shareholders and other equity holders 5,103 (1,933)
Other subsidiaries on a combined basis [Member]    
Condensed Income Statements, Captions [Line Items]    
Insurance service result 3,977 3,160
Investment result 3,646 (5,823)
Other revenue 6,736 6,225
Net income (loss) attributed to shareholders and other equity holders 4,785 (2,156)
Consolidating adjustments [Member]    
Condensed Income Statements, Captions [Line Items]    
Insurance service result 0  
Investment result (1,326) (1,100)
Other revenue (4) (3)
Net income (loss) attributed to shareholders and other equity holders (4,785) 2,156
Manulife Finance (Delaware), L.P.[Member]    
Condensed Income Statements, Captions [Line Items]    
Insurance service result 0  
Investment result 51 49
Other revenue (7) 15
Net income (loss) attributed to shareholders and other equity holders $ 1 $ 21