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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, 2021
Dec. 31, 2020
Disclosure of fair value measurement of assets [Line Items]    
Debt securities $ 224,139 $ 218,724
Private placements 42,842 40,756
Other invested assets 35,306 30,195
Public equities 28,067 23,722
Canadian Dollar Offered Rate [Member] | Interest Rate Benchmark Reform [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Floating rate invested assets 176 109
US Dollars London Interbank Offered Rate [Member] | Interest Rate Benchmark Reform [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Private placements 1,984 1,710
Floating rate invested assets 1,002 842
Australia Dollars Bank Bill Swap Rate [Member] | Interest Rate Benchmark Reform [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Private placements 166 180
New Zealand Dollars Bank Bill Market Rate [Member] | Interest Rate Benchmark Reform [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Private placements 43 46
Less than 1 year [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 2,196 1,971
Less than 90 days [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 347 129
Fair value [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Private placements 47,276 47,890
Change in the fair value of these invested assets 15 44
Public equities 28,067 23,722
Alternative long-duration assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets 31,204 26,172
Alternative long-duration assets [Member] | Private equity [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 11,598 7,954
Alternative long-duration assets [Member] | Power and infrastructure [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 9,824 9,127
Alternative long-duration assets [Member] | Oil and gas [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 1,950 2,296
Alternative long-duration assets [Member] | Timber and agriculture [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 5,259 4,819
Alternative long-duration assets [Member] | Other invested assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 2,573 1,976
Alternative long-duration assets [Member] | Fair value [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets 31,863 27,029
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 7,314 7,062
Cash equivalents 9,239 13,331
Cash 6,041 5,774
Other [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets leveraged leases 3,457 3,371
SPPI qualifying [member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets 323 246
SPPI non qualifying [member] | Fair value [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 0 94
Private placements 181 211
Other invested assets 518 380
ALDA strategy [member] | Public equity [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Public equities 5 229
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 $ 407 $ 376