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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Principal amount of debt $ 793 $ 793
Recorded outstanding principal and interest for these life policy loans 98 95
Loss and loss expense reserves 3,014 2,915
Life policy and investment contract reserves 3,014 2,915
Investment contract reserves    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Loss and loss expense reserves 1,586 1,562
Life policy and investment contract reserves 1,586 1,562
Deferred Annuity | Investment contract reserves    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Loss and loss expense reserves 762 761
Life policy and investment contract reserves 762 761
Structured Settlement Annuity | Investment contract reserves    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Loss and loss expense reserves 136 145
Life policy and investment contract reserves 136 145
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 33
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Cash and Cash Equivalents, Fair Value Disclosure $ 1,139 $ 900