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Investments (Concentrations of Credit Risk) (Details) - Foreign government - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Japan |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 20,960 | $ 22,606
Republic of Korea |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | 6,007 | 6,411
MEXICO |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 3,765 | $ 3,778

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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 + Details
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