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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets $ 297,202 $ 271,827  
Less: Liabilities arising from investing activities 272,694 247,257  
Financial assets 152,785 143,061  
Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 225,624 203,236  
Less: Liabilities arising from investing activities 2,998 2,298  
Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 41,468 39,687  
Less: Liabilities arising from investing activities 14 11  
Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 173,335 151,901  
Less: Liabilities arising from investing activities 2,026 2,284  
Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 10,821 11,648  
Less: Liabilities arising from investing activities 958 3  
Financial assets 10,821 11,648 $ 10,700
Investment contract liabilities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 2 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 2 3  
Derivative liabilities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 2,040 2,295  
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 14 11  
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 2,026 2,284  
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  
Put option liability | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 956 0  
Put option liability | 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  
Put option liability | 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  
Put option liability | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 956 0  
Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 6,446 5,576  
Debt securities      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 81,606 74,443  
Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 14,965 13,065  
Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 42,765 39,883  
Fair value through profit or loss | Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 3,890 3,830  
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 3,890 3,830  
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 3,875 3,815  
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 67,894 61,402  
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 67,894 61,402  
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 1,641 1,253  
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 66,005 59,776  
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 248 373  
Fair value through profit or loss | Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 13,826 11,866  
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 13,826 11,866  
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 13,811 11,852  
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 15 14  
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 1,748 1,380  
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 1,641 1,253  
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 106 125  
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 1 2  
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 5,181 4,929  
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 5,172 4,895  
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 9 34  
Fair value through profit or loss | Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 37,681 34,870  
Fair value through profit or loss | Corporate | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 37,681 34,870  
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 37,508 34,665  
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 173 205  
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 1,759 1,467  
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 1,753 1,464  
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 6 3  
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 2,176 1,961  
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 2,176 1,961  
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 157 143  
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 157 143  
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 1,476 956  
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 1,447 856  
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 29 100  
Available-for-sale | Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 2,556 1,746  
Available-for-sale | Canadian federal government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 2,556 1,746  
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 2,556 1,746  
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 13,712 13,041  
Available-for-sale | Debt securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 13,712 13,041  
Available-for-sale | Debt securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,363 1,513  
Available-for-sale | Debt securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 12,299 11,485  
Available-for-sale | Debt securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 50 43  
Available-for-sale | Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,139 1,199  
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 1,139 1,199  
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 1,139 1,199  
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 1,363 1,527  
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 1,363 1,513  
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 0 14  
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 736 717  
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 735 716  
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 1  
Available-for-sale | Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 5,084 5,013  
Available-for-sale | Corporate | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 5,084 5,013  
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 5,039 4,971  
Available-for-sale | Corporate | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 45 42  
Available-for-sale | Commercial mortgage-backed securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 777 766  
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 777 766  
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 362 386  
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 362 386  
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 730 804  
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 730 804  
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 0  
Available-for-sale | Other | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 965 883  
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 961 883  
Available-for-sale | Other | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 4 0  
Cash, cash equivalents and short-term securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 9,575 9,506  
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 9,044 8,926  
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 531 580  
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 67,894 61,402  
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 1,641 1,253  
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 66,005 59,776  
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 248 373  
Financial assets 248 373 417
Debt securities | Available-for-sale | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 13,712 13,041  
Debt securities | Available-for-sale | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,363 1,513  
Debt securities | Available-for-sale | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 12,299 11,485  
Debt securities | Available-for-sale | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 50 43  
Financial assets 50 43 136
Equity securities | Fair value through profit or loss | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 4,474 4,014  
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 1,868 1,967  
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 2,418 1,845  
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 188 202  
Financial assets 188 202 167
Equity securities | Available-for-sale | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 313 620  
Equity securities | Available-for-sale | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 152 398  
Equity securities | Available-for-sale | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 126 186  
Equity securities | Available-for-sale | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 35 36  
Financial assets 35 36 38
Derivative assets | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,548 1,112  
Derivative assets | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 20 27  
Derivative assets | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,528 1,085  
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 3,829 3,322  
Other invested assets | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,000 898  
Other invested assets | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 384 183  
Other invested assets | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 2,445 2,241  
Financial assets 2,445 2,241 1,721
Investment properties | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 7,306 7,157  
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 7,306 7,157  
Financial assets 7,306 7,157 7,067
Total invested assets measured at fair value | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 108,651 100,174  
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 15,088 14,982  
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 83,291 75,140  
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 10,272 10,052  
Financial assets 10,272 10,052 9,546
Investments for account of segregated fund holders | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 116,973 103,062  
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 26,380 24,705  
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 90,044 76,761  
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 549 1,596  
Financial assets $ 549 $ 1,596 $ 1,154