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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
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 77 71
Reserves for structured settlements 6,147 5,707
Life Policy Loans    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Recorded outstanding principal and interest for these life policy loans 32 33
Deferred Annuities and Structured Settlements    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Recorded reserves for the deferred annuities 760 787
Reserves for structured settlements 151 156
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Cash and Cash Equivalents, Fair Value Disclosure $ 767 $ 784