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FAIR VALUE MEASUREMENTS - Fair Value of Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Non-recurring basis | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long-term debt | $ 22,689 | $ 25,378

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