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Fair Value Measurements (Fair Value of Life Policy) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Fair value of life policy loans $ 49 $ 44
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Fair value of life policy loans 0 0
Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Fair value of life policy loans 0 0
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis    
Fair value of life policy loans $ 49 $ 44