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FAIR VALUE MEASUREMENTS - LONG-TERM DEBT (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value $ 488  
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,662 $ 475
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,778 $ 483