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FAIR VALUE MEASUREMENTS 2 (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt | $ 17,759 | $ 18,787
Carrying Value [Member] | Significant Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 161 | 137
Long-term debt and related current maturities | 17,759 | 18,787
Estimated Fair Value [Member] | Significant Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 155 | 132
Long-term debt and related current maturities | $ 18,861 | $ 20,176

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