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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Cash and cash equivalents $ 1,264 $ 1,139
Principal amount of debt 793 793
Recorded outstanding principal and interest for these life policy loans 92 98
Loss and loss expense reserves 3,059 3,014
Life policy and investment contract reserves 3,059 3,014
Investment contract reserves    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Loss and loss expense reserves 1,554 1,586
Life policy and investment contract reserves 1,554 1,586
Deferred Annuity | Investment contract reserves    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Loss and loss expense reserves 735 762
Life policy and investment contract reserves 735 762
Structured Settlement Annuity | Investment contract reserves    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Loss and loss expense reserves 129 136
Life policy and investment contract reserves 129 136
Life Policy Loans    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Recorded outstanding principal and interest for these life policy loans $ 31 $ 31