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Fair Value Measurements - Carrying Value and Fair Value of Other Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including current maturities $ 3,903 $ 4,144
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including current maturities 4,016 4,235
Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including current maturities $ 3,990 $ 4,211