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Investments (Components of Net Investment Gains Losses - Asset Type) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Marketable Securities, Gain (Loss) [Abstract] |  |
Fixed maturity securities AFS | $ (85) | $ (580)
Equity Securities, FV-NI, Gain (Loss) | 28 | 48
Other net investment gains (losses): |  |
Mortgage loans | (86) | (164)
Real estate and real estate joint ventures (excluding changes in estimated fair value) | 35 | 18
Other limited partnership interests (excluding changes in estimated fair value) | (50) | 9
Other gains (losses) | 6 | (23)
Subtotal - investment portfolio gains (losses) | (152) | (692)
Change In Estimated Fair Value Of Other Limited Partnership Interests And Real Estate Joint Ventures | 3 | (5)
Non-investment portfolio gains (losses) | (226) | 13
Subtotal | (223) | 8
Net investment gains (losses) | $ (375) | $ (684)

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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + 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(7)(c)) -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(9)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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