FAIR VALUE MEASUREMENTS 2 (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	$ 137	$ 129
Long-term debt and related current maturities	18,787	12,486
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	132	127
Long-term debt and related current maturities	$ 20,176	$ 13,578