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FAIR VALUE MEASUREMENTS - Fair Value of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
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