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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 1,531 | $ 1,228 | $ 4,280 | $ 3,359
Investment expense | (56) | (40) | (165) | (128)
Investment income, net of related expenses | 1,475 | 1,188 | 4,115 | 3,231
Available-for-sale Securities [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 1,221 | 933 | 3,393 | 2,574
Equity securities |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 2 | 2 | 5 | 5
Mortgage Loans on Real Estate [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 144 | 103 | 391 | 290
Policy loans |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 44 | 14 | 74 | 42
Funds withheld at interest |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 81 | 88 | 215 | 253
Short-term Investments [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 42 | 48 | 123 | 126
Partnership Interest |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 0 | 46 | 88 | 74
Other invested assets |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ (3) | $ (6) | $ (9) | $ (5)

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- Definition This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income. + References No definition available. + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-10 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-14 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 5 -SubTopic 220 -Topic 946 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479105/946-220-45-5 + Details
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