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Commitments and Contingencies - Summary of Condensed Consolidated Statements of Financial Position for MFC and MFLP (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets $ 414,001 $ 427,098  
Total other assets 86,378 90,757  
Segregated funds net assets 348,562 399,788  
Insurance contract liabilities 371,405 392,275 $ 385,554
Investment contract liabilities 3,248 3,117  
Segregated funds net liabilities 348,562 399,788  
Total other liabilities 69,347 63,594  
MFC [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets 63 78  
Total other assets 67,543 68,866  
Total other liabilities 11,545 10,536  
Other subsidiaries of MFC on a combined basis [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets 413,938 427,020  
Total other assets 90,687 94,615  
Segregated funds net assets 348,562 399,788  
Insurance contract liabilities 371,405 392,275  
Investment contract liabilities 3,248 3,117  
Segregated funds net liabilities 348,562 399,788  
Total other liabilities 58,246 53,962  
Consolidating adjustments [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Total other assets (71,852) (72,724)  
Total other liabilities (444) (904)  
Manulife Finance (Delaware), L.P.[Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets 21 3  
Total other assets 950 1,088  
Total other liabilities $ 712 $ 852