XML 105 R80.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Dec. 31, 2017
Major components of tax expense (income) [abstract]      
Effective income tax rate   26.75% 26.75%
Provisional charge for the estimated impact of U.S. Tax Reform, after-tax $ 1,800    
Gain from impact of tax reform   $ 124  
Increase in insurance contract liabilities   196  
Current tax receivable   1,712 $ 778
Current tax payable   118 178
Deferred tax assets   4,318 4,569
Deferred tax assets - recognition dependent on future taxable profits   3,508 4,527
Operating tax loss carry forward   4,838 3,164
Operating tax loss carry forward expired in future   4,713  
Operating tax loss carry forward without expiration date   125  
Capital tax loss carry forward   20 8
Tax benefit on loss carry forwards for which deferred tax asset recognized   1,019 596
Tax benefit of loss carry forwards for which no deferred tax asset recognized   121 171
Tax credit carry forwards which expire in future   426 606
Tax credit carryforwards of which benefit not recognized   $ 165 152
Tax credit/Loss carryforwards expiration period   Between the years 2020 and 2038  
Deferred tax liability   $ 1,814 1,281
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements   $ 16,570 $ 11,780