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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities Measured on a Non-Recurring Basis and Fair Value of Long-term Debt, Narrative (Details) - Nonrecurring adjustment - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-current assets held for sale	$ 0	$ 245
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-current assets held for sale	0	245
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-current assets held for sale	0	0
Fair value of long-term debt	$ 22,735	$ 25,378

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Fair value portion of assets classified as held for sale.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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