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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
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 95 77
Loss and loss expense reserves 2,915 2,835
Life policy and investment contract reserves 2,915 2,835
Investment contract reserves    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Loss and loss expense reserves 1,562 1,559
Life policy and investment contract reserves 1,562 1,559
Life Policy Loans    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Recorded outstanding principal and interest for these life policy loans 33 32
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Cash and Cash Equivalents, Fair Value Disclosure $ 900 $ 767