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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets $ 323,011 $ 297,202  
Less: Liabilities arising from investing activities 297,149 272,694  
Financial assets 168,785 152,785  
Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 249,011 225,624  
Less: Liabilities arising from investing activities 1,746 2,042  
Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 46,644 41,468  
Less: Liabilities arising from investing activities 13 14  
Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 191,136 173,335  
Less: Liabilities arising from investing activities 1,731 2,026  
Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 11,231 10,821  
Less: Liabilities arising from investing activities 2 2  
Financial assets 11,231 10,821 $ 11,648
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 2  
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 2  
Derivative liabilities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Less: Liabilities arising from investing activities 1,744 2,040  
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 13 14  
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 1,731 2,026  
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 6,489 6,446  
Debt securities      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 89,089 81,606  
Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 18,242 14,965  
Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 46,974 42,765  
Fair value through profit or loss | Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 4,560 3,890  
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 4,560 3,890  
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 4,546 3,875  
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 14 15  
Fair value through profit or loss | Debt securities      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 77,834 67,894  
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 77,834 67,894  
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 1,537 1,641  
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 76,072 66,005  
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 225 248  
Fair value through profit or loss | Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 16,909 13,826  
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 16,909 13,826  
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 16,909 13,811  
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 0 15  
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 1,678 1,748  
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 1,537 1,641  
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 141 106  
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 0 1  
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 5,281 5,181  
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 5,274 5,172  
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 7 9  
Fair value through profit or loss | Corporate      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 42,664 37,681  
Fair value through profit or loss | Corporate | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 42,664 37,681  
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 42,507 37,508  
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 157 173  
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 2,205 1,759  
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 2,199 1,753  
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 6  
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 2,459 2,176  
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 2,459 2,176  
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 389 157  
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 389 157  
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 1,689 1,476  
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 1,648 1,447  
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 41 29  
Available-for-sale | Canadian federal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,929 2,556  
Available-for-sale | Canadian federal government | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,929 2,556  
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 1,929 2,556  
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 11,255 13,712  
Available-for-sale | Debt securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 11,255 13,712  
Available-for-sale | Debt securities | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 796 1,363  
Available-for-sale | Debt securities | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 10,392 12,299  
Available-for-sale | Debt securities | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 67 50  
Available-for-sale | Canadian provincial and municipal government      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 1,333 1,139  
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 1,333 1,139  
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 1,333 1,139  
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 797 1,363  
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 796 1,363  
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 1 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 823 736  
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 822 735  
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 4,310 5,084  
Available-for-sale | Corporate | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 4,310 5,084  
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 4,258 5,039  
Available-for-sale | Corporate | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 52 45  
Available-for-sale | Commercial mortgage-backed securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 752 777  
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 750 777  
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 2 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 292 362  
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 292 362  
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 531 730  
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 531 730  
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 488 965  
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 476 961  
Available-for-sale | Other | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Financial assets 12 4  
Cash, cash equivalents and short-term securities | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 13,527 9,575  
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 12,428 9,044  
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 1,099 531  
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 77,834 67,894  
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 1,537 1,641  
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 76,072 66,005  
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 225 248  
Financial assets 225 248 373
Debt securities | Available-for-sale | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 11,255 13,712  
Debt securities | Available-for-sale | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 796 1,363  
Debt securities | Available-for-sale | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 10,392 12,299  
Debt securities | Available-for-sale | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 67 50  
Financial assets 67 50 43
Equity securities | Fair value through profit or loss | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 6,369 4,474  
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 3,777 1,868  
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 2,411 2,418  
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 181 188  
Financial assets 181 188 202
Equity securities | Available-for-sale | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 262 313  
Equity securities | Available-for-sale | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 144 152  
Equity securities | Available-for-sale | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 71 126  
Equity securities | Available-for-sale | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 47 35  
Financial assets 47 35 36
Derivative assets | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 2,160 1,548  
Derivative assets | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 36 20  
Derivative assets | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 2,124 1,528  
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 4,167 3,829  
Other invested assets | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 1,094 1,000  
Other invested assets | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 428 384  
Other invested assets | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 2,645 2,445  
Financial assets 2,645 2,445 2,241
Investment properties | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 7,516 7,306  
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 7,516 7,306  
Financial assets 7,516 7,306 7,157
Total invested assets measured at fair value | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 123,090 108,651  
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 19,812 15,088  
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 92,597 83,291  
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 10,681 10,272  
Financial assets 10,681 10,272 10,052
Investments for account of segregated fund holders | Recurring fair value measurement      
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items]      
Assets 125,921 116,973  
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 26,832 26,380  
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 98,539 90,044  
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 550 549  
Financial assets $ 550 $ 549 $ 1,596