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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]      
Net A&EP adverse development before consideration of LPT $ 86 $ 92 $ 143
Provision for uncollectible third-party reinsurance on A&EP 0 (5) (5)
Total additional amounts ceded under LPT 86 87 138
Retroactive reinsurance benefit recognized (94) (91) (107)
Pretax impact of deferred retroactive reinsurance $ (8) $ (4) $ 31