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Fair Value Measurements (Schedule Of The Carrying Amount And Estimated Fair Value Of The Company's Financial Instruments That Are Recorded At Fair Value On A Recurring Basis) (Details) - Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable securities   $ 7
Total financial assets   7
Total financial liabilities $ 47 27
Carrying Value [Member] | Other Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 10 5
Carrying Value [Member] | Other Long-Term Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 36 22
Estimated Fair Value [Member] | Quoted Price In Active Markets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable securities   7
Total financial assets   7
Total financial liabilities 0 0
Estimated Fair Value [Member] | Quoted Price In Active Markets (Level 1) [Member] | Other Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 0 0
Estimated Fair Value [Member] | Quoted Price In Active Markets (Level 1) [Member] | Other Long-Term Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 0 0
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable securities   0
Total financial assets   0
Total financial liabilities 47 27
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 10 5
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 36 22
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable securities   0
Total financial assets   0
Total financial liabilities 0 0
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 0 0
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts $ 0 $ 0