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Investments (Concentrations of Credit Risk) (Details) - Foreign government - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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JAPAN |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 18,886 | $ 22,606
Republic of Korea |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | 6,078 | 6,411
MEXICO |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 3,468 | $ 3,778

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- Definition Fair value of investment subject to concentration of credit or market risk or both. + 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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