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Income Taxes - Temporary Differences in Deferred Tax Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 1,209 $ 1,295
Liabilities 322 403
Total net deferred tax asset 887 892
Investments    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets (738) (841)
Liabilities 8 116
Policy liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 1,116 1,218
Liabilities 379 322
Deferred acquisition costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 95 84
Liabilities (1) 7
Losses available for carry forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 600 543
Liabilities (48) (6)
Pension and other employee benefits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 183 201
Liabilities (136) (150)
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets (47) 90
Liabilities $ 120 $ 114