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Total Invested Assets and Related Net Investment Income - Assets and Liabilities Carried at Fair Value on a Recurring Basis by Hierarchy (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets $ 271,827 $ 269,112  
Less: Liabilities arising from investing activities 247,257 246,141  
Financial assets 143,061 137,691  
Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 203,236 205,239  
Less: Liabilities arising from investing activities 2,298 1,759  
Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 39,687 42,113  
Less: Liabilities arising from investing activities 11 5  
Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 151,901 152,426  
Less: Liabilities arising from investing activities 2,284 1,751  
Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 11,648 10,700  
Less: Liabilities arising from investing activities 3 3  
Financial assets 11,648 10,700 $ 9,785
Investment contract liabilities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 3 3  
Investment contract liabilities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 0 0  
Investment contract liabilities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 0 0  
Investment contract liabilities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 3 3  
Derivative liabilities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 2,295 1,756  
Derivative liabilities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 11 5  
Derivative liabilities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 2,284 1,751  
Derivative liabilities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 0 0  
Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 5,576 5,198  
Debt securities      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 74,443 72,619  
Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 13,065 13,296  
Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 39,883 40,064  
Fair value through profit or loss | Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 3,830 3,366  
Fair value through profit or loss | Canadian federal government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 3,830 3,366  
Fair value through profit or loss | Canadian federal government | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Canadian federal government | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 3,815 3,351  
Fair value through profit or loss | Canadian federal government | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 15 15  
Fair value through profit or loss | Debt securities      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 61,402 59,967  
Fair value through profit or loss | Debt securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 61,402 59,967  
Fair value through profit or loss | Debt securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,253 1,103  
Fair value through profit or loss | Debt securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 59,776 58,447  
Fair value through profit or loss | Debt securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 373 417  
Fair value through profit or loss | Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 11,866 12,158  
Fair value through profit or loss | Canadian provincial and municipal government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 11,866 12,158  
Fair value through profit or loss | Canadian provincial and municipal government | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Canadian provincial and municipal government | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 11,852 12,142  
Fair value through profit or loss | Canadian provincial and municipal government | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 14 16  
Fair value through profit or loss | U.S. government and agency | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,380 1,231  
Fair value through profit or loss | U.S. government and agency | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,253 1,103  
Fair value through profit or loss | U.S. government and agency | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 125 125  
Fair value through profit or loss | U.S. government and agency | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 2 3  
Fair value through profit or loss | Other foreign government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 4,929 5,361  
Fair value through profit or loss | Other foreign government | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Other foreign government | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 4,895 5,318  
Fair value through profit or loss | Other foreign government | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 34 43  
Fair value through profit or loss | Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 34,870 34,170  
Fair value through profit or loss | Corporate | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 34,870 34,170  
Fair value through profit or loss | Corporate | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Corporate | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 34,665 33,864  
Fair value through profit or loss | Corporate | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 205 306  
Fair value through profit or loss | Commercial mortgage-backed securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,467 1,460  
Fair value through profit or loss | Commercial mortgage-backed securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Commercial mortgage-backed securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,464 1,459  
Fair value through profit or loss | Commercial mortgage-backed securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 3 1  
Fair value through profit or loss | Residential mortgage-backed securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,961 1,625  
Fair value through profit or loss | Residential mortgage-backed securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Residential mortgage-backed securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,961 1,625  
Fair value through profit or loss | Residential mortgage-backed securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Collateralized debt obligations | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 143 55  
Fair value through profit or loss | Collateralized debt obligations | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Collateralized debt obligations | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 143 55  
Fair value through profit or loss | Collateralized debt obligations | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Other | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 956 541  
Fair value through profit or loss | Other | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Fair value through profit or loss | Other | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 856 508  
Fair value through profit or loss | Other | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 100 33  
Available-for-sale | Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,746 1,832  
Available-for-sale | Canadian federal government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,746 1,832  
Available-for-sale | Canadian federal government | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Canadian federal government | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,746 1,832  
Available-for-sale | Canadian federal government | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Debt securities      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 13,041 12,652  
Available-for-sale | Debt securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 13,041 12,652  
Available-for-sale | Debt securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,513 818  
Available-for-sale | Debt securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 11,485 11,698  
Available-for-sale | Debt securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 43 136  
Available-for-sale | Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,199 1,138  
Available-for-sale | Canadian provincial and municipal government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,199 1,138  
Available-for-sale | Canadian provincial and municipal government | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Canadian provincial and municipal government | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,199 1,138  
Available-for-sale | Canadian provincial and municipal government | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | U.S. government and agency | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,527 818  
Available-for-sale | U.S. government and agency | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,513 818  
Available-for-sale | U.S. government and agency | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 14 0  
Available-for-sale | U.S. government and agency | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Other foreign government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 717 752  
Available-for-sale | Other foreign government | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Other foreign government | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 716 752  
Available-for-sale | Other foreign government | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1 0  
Available-for-sale | Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 5,013 5,894  
Available-for-sale | Corporate | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 5,013 5,894  
Available-for-sale | Corporate | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Corporate | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 4,971 5,838  
Available-for-sale | Corporate | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 42 56  
Available-for-sale | Commercial mortgage-backed securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 766 744  
Available-for-sale | Commercial mortgage-backed securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Commercial mortgage-backed securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 766 744  
Available-for-sale | Commercial mortgage-backed securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Residential mortgage-backed securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 386 398  
Available-for-sale | Residential mortgage-backed securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Residential mortgage-backed securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 386 398  
Available-for-sale | Residential mortgage-backed securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Collateralized debt obligations | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 804 414  
Available-for-sale | Collateralized debt obligations | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Collateralized debt obligations | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 804 345  
Available-for-sale | Collateralized debt obligations | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 69  
Available-for-sale | Other | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 883 662  
Available-for-sale | Other | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 0  
Available-for-sale | Other | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 883 651  
Available-for-sale | Other | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 0 11  
Cash, cash equivalents and short-term securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 9,506 8,890  
Cash, cash equivalents and short-term securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 8,926 7,683  
Cash, cash equivalents and short-term securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 580 1,207  
Cash, cash equivalents and short-term securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 0 0  
Debt securities | Fair value through profit or loss | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 61,402 59,967  
Debt securities | Fair value through profit or loss | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,253 1,103  
Debt securities | Fair value through profit or loss | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 59,776 58,447  
Debt securities | Fair value through profit or loss | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 373 417  
Financial assets 373 417 442
Debt securities | Available-for-sale | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 13,041 12,652  
Debt securities | Available-for-sale | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,513 818  
Debt securities | Available-for-sale | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 11,485 11,698  
Debt securities | Available-for-sale | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 43 136  
Financial assets 43 136 191
Equity securities | Fair value through profit or loss | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 4,014 5,078  
Equity securities | Fair value through profit or loss | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,967 3,379  
Equity securities | Fair value through profit or loss | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,845 1,532  
Equity securities | Fair value through profit or loss | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 202 167  
Financial assets 202 167 144
Equity securities | Available-for-sale | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 620 942  
Equity securities | Available-for-sale | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 398 710  
Equity securities | Available-for-sale | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 186 194  
Equity securities | Available-for-sale | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 36 38  
Financial assets 36 38 7
Derivative assets | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,112 1,478  
Derivative assets | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 27 27  
Derivative assets | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,085 1,451  
Derivative assets | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 0 0  
Other invested assets | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 3,322 2,773  
Other invested assets | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 898 912  
Other invested assets | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 183 140  
Other invested assets | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 2,241 1,721  
Financial assets 2,241 1,721 1,544
Investment properties | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 7,157 7,067  
Investment properties | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 0 0  
Investment properties | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 0 0  
Investment properties | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 7,157 7,067  
Financial assets 7,157 7,067 6,592
Total invested assets measured at fair value | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 100,174 98,847  
Total invested assets measured at fair value | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 14,982 14,632  
Total invested assets measured at fair value | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 75,140 74,669  
Total invested assets measured at fair value | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 10,052 9,546  
Financial assets 10,052 9,546 8,920
Investments for account of segregated fund holders | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 103,062 106,392  
Investments for account of segregated fund holders | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 24,705 27,481  
Investments for account of segregated fund holders | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 76,761 77,757  
Investments for account of segregated fund holders | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,596 1,154  
Financial assets $ 1,596 $ 1,154 $ 865