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Claim and Claim Adjustment Expense Reserves (Impact of Loss Portfolio Transfer on the Consolidated Statement of Operations) (Details) - Asbestos and Environmental Reserves - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]      
Net A&EP adverse development before consideration of LPT $ 103 $ 86 $ 92
Provision for uncollectible third-party reinsurance on A&EP 0 0 (5)
Total additional amounts ceded under LPT 103 86 87
Retroactive reinsurance benefit recognized (95) (94) (91)
Pretax impact of deferred retroactive reinsurance $ 8 $ (8) $ (4)