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FAIR VALUE MEASUREMENTS 2 (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt $ 17,690,000,000 $ 18,787,000,000
Carrying Value [Member] | Significant Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Current 242,000,000 0
Long-term receivables 170,000,000 137,000,000
Long-term investment 353,000,000 0
Long-term debt and related current maturities 17,690,000,000 18,787,000,000
Estimated Fair Value [Member] | Significant Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Current 242,000,000 0
Long-term receivables 155,000,000 132,000,000
Long-term investment 353,000,000 0
Long-term debt and related current maturities $ 18,888,000,000 $ 20,176,000,000