Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
segments
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]    
Number of operating segments 4  
Number of reportable segments 1  
Other Noncurrent Assets    
Schedule of Equity Method Investments [Line Items]    
Investment in affiliates | $ $ 116 $ 105