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Fair Value Measurements (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity investments without readily determinable fair values, carrying amount $ 171 $ 171
Equity investments without readily determinable fair values, fair value 0 0
Insurance contracts in nonqualified trusts, carrying amount 28 30
Insurance contracts in nonqualified trusts, fair value 29 31
Long-term debt, including current installments of long-term debt, carrying amount 3,578 3,671
Long-term debt, including current installments of long-term debt, fair value 3,749 3,845
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity investments without readily determinable fair values, fair value 0 0
Insurance contracts in nonqualified trusts, fair value 29 31
Long-term debt, including current installments of long-term debt, fair value 3,555 3,644
Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity investments without readily determinable fair values, fair value 0 0
Insurance contracts in nonqualified trusts, fair value 0 0
Long-term debt, including current installments of long-term debt, fair value $ 194 $ 201