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Investments - Portfolio composition (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Investments [Abstract] |  |
Total fixed income securities | $ 41,715 | $ 42,136
Equity securities, at fair value | 4,723 | 7,061
Mortgage loans, net | 833 | 821
Limited partnership interests | 7,907 | 8,018
Short-term investments, at fair value | 4,030 | 4,009
Other investments, net | 1,798 | 2,656
Total investments | $ 61,006 | $ 64,701

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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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