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FAIR VALUE MEASUREMENTS - Book Values and Fair Values of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Book values    
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Short-term debt $ 51 $ 0
Current maturities of long-term debt and finance lease obligations 406 406
Long-term debt and finance lease obligations 5,710 5,786
Fair values    
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Short-term debt 51 0
Current maturities of long-term debt and finance lease obligations 406 409
Long-term debt and finance lease obligations $ 6,236 $ 6,471