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Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Realized capital gains and losses by asset type |  |
Net gains (losses) on investments and derivatives | $ (349) | $ (164)
Fixed income securities |  |
Realized capital gains and losses by asset type |  |
Net gains (losses) on investments and derivatives | (128) | (101)
Equity securities |  |
Realized capital gains and losses by asset type |  |
Net gains (losses) on investments and derivatives | (112) | 62
Limited partnership interests |  |
Realized capital gains and losses by asset type |  |
Net gains (losses) on investments and derivatives | (5) | 8
Derivatives |  |
Realized capital gains and losses by asset type |  |
Net gains (losses) on investments and derivatives | (19) | (8)
Other investments |  |
Realized capital gains and losses by asset type |  |
Net gains (losses) on investments and derivatives | (18) | (2)
Other |  |
Realized capital gains and losses by asset type |  |
Net gains (losses) on investments and derivatives | $ (67) | $ (123)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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