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Investments - Portfolio composition (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Investments [Abstract] |  |
Fixed income securities, at fair value | $ 45,550 | $ 42,485
Equity securities, at fair value | 2,290 | 4,567
Mortgage loans, net | 823 | 762
Limited partnership interests | 8,150 | 8,114
Short-term investments, at fair value | 5,137 | 4,173
Other investments, net | 1,718 | 1,728
Total investments | $ 63,668 | $ 61,829

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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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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