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Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | $ (144) | $ (103) | $ (493) | $ (267)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | (250) | (96) | (378) | (197)
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | 164 | 14 | 52 | 76
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | 0 | 1 | 0 | 1
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | 13 | (13) | 8 | (5)
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | (65) | (15) | (84) | (23)
Other investments |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | (6) | 6 | (24) | 4
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | $ 0 | $ 0 | $ (67) | $ (123)

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