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Investments (Concentrations of Credit Risk) (Details) - Foreign government - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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JAPAN |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 24,295 | $ 32,723
Republic of Korea |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | 5,887 | $ 7,117
MEXICO |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 3,463 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 + Details
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