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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 2,667 | $ 2,396 | $ 2,257
Investment expenses | (99) | (91) | (80)
Total net investment income | 2,568 | 2,305 | 2,177
Total fixed maturities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 2,204 | 1,895 | 1,469
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 35 | 45 | 57
Mortgage loans |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 266 | 235 | 211
Limited partnerships and other alternative investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 148 | 212 | 515
Other investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 14 | $ 9 | $ 5

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- Definition Amount, before 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/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 + Details
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