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Insurance Contract Liabilities and Reinsurance Assets - Summary of Composition of Insurance Contract Liabilities and Reinsurance Assets by Line of Business and Reporting Segment (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities CAD 274,246 CAD 262,553  
Total reinsurance ceded (30,359) (34,952)  
Total, gross of reinsurance ceded 304,605 297,505 CAD 285,288
Other insurance contract liabilities [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Total, gross of reinsurance ceded 11,155 10,815 CAD 10,050
Gross insurance contract liabilities [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 274,246 262,553  
Total reinsurance ceded 30,359 34,952  
Total, gross of reinsurance ceded 304,605 297,505  
Gross insurance contract liabilities [Member] | Corporate and other [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities (46) (590)  
Total reinsurance ceded 172 259  
Total, gross of reinsurance ceded 126 (331)  
Gross insurance contract liabilities [Member] | Asia [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 62,243 54,567  
Total reinsurance ceded 911 880  
Total, gross of reinsurance ceded 63,154 55,447  
Gross insurance contract liabilities [Member] | Canada [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 76,198 73,384  
Total reinsurance ceded (676) 593  
Total, gross of reinsurance ceded 75,522 73,977  
Gross insurance contract liabilities [Member] | U.S [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 135,851 135,192  
Total reinsurance ceded 29,952 33,220  
Total, gross of reinsurance ceded 165,803 168,412  
Gross insurance contract liabilities [Member] | Individual insurance participating [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 52,438 49,913  
Total reinsurance ceded 11,492 13,558  
Total, gross of reinsurance ceded 63,930 63,471  
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] | Asia [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 32,737 29,520  
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] | Canada [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 11,132 10,974  
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] | U.S [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 8,569 9,419  
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 113,880 106,240  
Total reinsurance ceded 11,238 12,122  
Total, gross of reinsurance ceded 125,118 118,362  
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | Corporate and other [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities (515) (833)  
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | Asia [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 22,705 18,799  
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | Canada [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 34,091 31,790  
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | U.S [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 57,599 56,484  
Gross insurance contract liabilities [Member] | Annuities and pensions [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 49,716 51,810  
Total reinsurance ceded 6,539 8,159  
Total, gross of reinsurance ceded 56,255 59,969  
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | Corporate and other [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 48 62  
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | Asia [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 4,366 3,599  
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | Canada [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 19,141 19,620  
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | U.S [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 26,161 28,529  
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 58,212 54,590  
Total reinsurance ceded 1,090 1,113  
Total, gross of reinsurance ceded 59,302 55,703  
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | Corporate and other [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 421 181  
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | Asia [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 2,435 2,649  
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | Canada [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities 11,834 11,000  
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | U.S [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Net insurance contract liabilities CAD 43,522 CAD 40,760