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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets $ 353,664 $ 334,222  
Total other assets 83,398 71,004  
Segregated funds net assets 313,209 324,307  
Insurance contract liabilities 328,654 304,605 $ 297,505
Investment contract liabilities 3,265 3,126  
Segregated funds net liabilities 313,209 324,307  
Total other liabilities 57,992 55,332  
MFC [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets 21 21  
Total other assets 54,346 48,688  
Total other liabilities 8,403 7,696  
MLI consolidated [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets 353,632 334,191  
Total other assets 83,523 71,180  
Segregated funds net assets 313,209 324,307  
Insurance contract liabilities 328,654 304,605  
Investment contract liabilities 3,265 3,126  
Segregated funds net liabilities 313,209 324,307  
Total other liabilities 50,043 48,145  
Other subsidiaries of MFC on a combined basis [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets 11 10  
Total other assets 3 4  
Consolidating adjustments [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Total other assets (54,474) (48,868)  
Total other liabilities (454) (509)  
Manulife Finance (Delaware), L.P.[Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Invested assets 11 5  
Total other assets 1,059 1,033  
Total other liabilities $ 833 $ 831