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Fair Value Measurements (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Value $ 164 $ 159
Equity Securities, FV-NI and without Readily Determinable Fair Value 0 0
Insurance contracts in nonqualified pension trusts, carrying amount 37 42
Insurance contracts in nonqualified pension trusts, fair value 37 42
Long-term debt, including current installments of long-term debt, carrying amount 3,355 3,398
Long-term debt, including current installments of long-term debt, fair value 3,372 3,507
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity Securities, FV-NI and without Readily Determinable Fair Value 0 0
Insurance contracts in nonqualified pension trusts, fair value 37 42
Long-term debt, including current installments of long-term debt, fair value 3,204 3,299
Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity Securities, FV-NI and without Readily Determinable Fair Value 0 0
Insurance contracts in nonqualified pension trusts, fair value 0 0
Long-term debt, including current installments of long-term debt, fair value $ 168 $ 208