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Invested Assets and Investment Income - Schedule of Carrying Values and Fair Values of Invested Assets (Parenthetical) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets [Line Items]    
Debt securities $ 185,594 $ 174,000
Private placements 35,754 32,132
Other invested assets 27,543 24,483
Change in the fair value of these invested assets (460) 832
Invested assets 353,664 334,222
Less than 1 year [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 870 1,768
Less than 90 days [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 40 161
Fair value [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Private placements 36,103 34,581
Change in the fair value of these invested assets 21  
Invested assets 356,217 339,488
Alternative long-duration assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets 23,438 20,730
Alternative long-duration assets [Member] | Private equity [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 6,769 4,959
Alternative long-duration assets [Member] | Power and infrastructure [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 7,970 7,355
Alternative long-duration assets [Member] | Oil and gas [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 3,416 2,813
Alternative long-duration assets [Member] | Timber and agriculture [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 4,493 5,033
Alternative long-duration assets [Member] | Other invested assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 791 570
Alternative long-duration assets [Member] | Hydroelectric Power [member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value   426
Alternative long-duration assets [Member] | Fair value [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets 24,211 21,053
Cash and short-term securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Short-term securities with maturities of less than one year 2,530 2,737
Cash equivalents 8,713 9,131
Cash 4,972 4,097
Other [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets leveraged leases 3,575 3,273
SPPI qualifying [member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets 600  
SPPI non qualifying [member] | Fair value [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 105  
Private placements 230  
Other invested assets 465  
Accumulated depreciation and amortisation [Member] | Real estate own use property [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Accumulated depreciation of own use property 391 389
John Hancock Infrastructure Master Fund LP [member]    
Disclosure of fair value measurement of assets [Line Items]    
Invested assets $ 1,422  
John Hancock Infrastructure Master Fund LP [member] | Top of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Partnership voting rights 1.00%  
Manulife Us Real Estate Investment Trust [member]    
Disclosure of fair value measurement of assets [Line Items]    
Invested assets $ 510 $ 395
Partnership voting rights 8.50% 9.50%
Other joint ventures [member]    
Disclosure of fair value measurement of assets [Line Items]    
Invested assets $ 1,314  
Hancock Us Real Estate Fund Lp [member]    
Disclosure of fair value measurement of assets [Line Items]    
Invested assets   $ 619
Partnership voting rights   11.70%