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Fair Value Measurements - Book Values and Fair Values of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Book Values    
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Short-term debt $ 1 $ 226
Current maturities of long-term debt and finance lease obligations 318 315
Long-term debt and finance lease obligations 6,055 4,809
Fair values    
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Short-term debt 1 226
Current maturities of long-term debt and finance lease obligations 318 315
Long-term debt and finance lease obligations $ 6,743 $ 5,156