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Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | $ (168) | $ (225) | $ (300)
Fixed income securities |  |  |
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | (215) | (200) | (540)
Equity securities |  |  |
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | 257 | 82 | 282
Mortgage loans |  |  |
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | (2) | (1) | (4)
Limited partnership interests |  |  |
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | (18) | (9) | 4
Derivatives |  |  |
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | (76) | (14) | (84)
Other investments |  |  |
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | (47) | 40 | 42
Other |  |  |
Realized capital gains and losses by asset type |  |  |
Net gains (losses) on investments and derivatives | $ (67) | $ (123) | $ 0

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