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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, 2021
Dec. 31, 2020
Condensed Income Statements, Captions [Line Items]    
Total revenue $ 61,821 $ 78,908
Net income (loss) attributed to shareholders and other equity holders 7,105 5,871
MFC [Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue 563 547
Net income (loss) attributed to shareholders and other equity holders 7,105 5,871
MLI consolidated [Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue 61,787 78,929
Net income (loss) attributed to shareholders and other equity holders 7,342 6,179
Other subsidiaries of MFC on a combined basis [Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue 536 520
Net income (loss) attributed to shareholders and other equity holders (500) (500)
Consolidating adjustments [Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue (1,065) (1,088)
Net income (loss) attributed to shareholders and other equity holders (6,842) (5,679)
Manulife Finance (Delaware), L.P.[Member]    
Condensed Income Statements, Captions [Line Items]    
Total revenue 41 32
Net income (loss) attributed to shareholders and other equity holders $ 3 $ (1)