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Investments (Components of Net Investment Gains Losses - Asset Type) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Marketable Securities, Gain (Loss) [Abstract] |  |  |  |
Fixed maturity securities AFS | $ (157) | $ (698) | $ (488) | $ (2,274)
Net investment gains (losses) | (31) | (14) | (22) | 66
Other net investment gains (losses): |  |  |  |
Mortgage loans | (151) | 11 | (246) | (194)
Real estate and real estate joint ventures (excluding changes in estimated fair value) | 128 | 1 | 175 | 32
Other limited partnership interests (excluding changes in estimated fair value) | 4 | 0 | (55) | 12
Other gains (losses) | (57) | (161) | (28) | (141)
Subtotal - investment portfolio gains (losses) | (264) | (861) | (664) | (2,499)
Change In Estimated Fair Value Of Other Limited Partnership Interests And Real Estate Joint Ventures | (1) | (3) | 5 | (6)
Non-investment portfolio gains (losses) | 188 | (63) | (214) | (145)
Subtotal | 187 | (66) | (209) | (151)
Net investment gains (losses) | $ (77) | $ (927) | $ (873) | $ (2,650)

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