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Invested Assets and Investment Income - Schedule of Carrying Values and Fair Values of Invested Assets (Parenthetical) (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [Line Items]    
Debt securities CAD 174,000 CAD 168,622
Less than 1 year [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 1,768 893
Less than 90 days [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Debt securities 161 192
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 2,737 3,111
Cash equivalents 9,131 8,863
Cash 4,097 3,177
Other [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets leveraged leases 3,273 3,369
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 389 404
Private equity [Member] | Alternative long-duration assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 4,959 4,619
Power and infrastructure [Member] | Alternative long-duration assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 7,355 6,679
Oil and gas [Member] | Alternative long-duration assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 2,813 2,093
Timber and agriculture [Member] | Alternative long-duration assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value 5,033 4,972
Other invested assets [Member] | Alternative long-duration assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Total carrying value CAD 570 CAD 488