FAIR VALUE MEASUREMENTS 2 (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 17,783,000,000	$ 18,787,000,000
Carrying Value [Member] | Significant Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	186,000,000	137,000,000
Long-term investment	584,000,000	0
Long-term debt and related current maturities	17,783,000,000	18,787,000,000
Estimated Fair Value [Member] | Significant Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	178,000,000	132,000,000
Long-term investment	584,000,000	0
Long-term debt and related current maturities	$ 19,044,000,000	$ 20,176,000,000