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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Inputs (Details) - Recurring fair value measurement - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 1,330 $ 1,051
Financial liabilities (current and non-current) 759 490
Level 1 | Financial liabilities (current and non-current)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 0 0
Level 1 | Marketable securities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 306 142
Level 1 | Financial assets (current and non-current)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0 0
Level 2 | Financial liabilities (current and non-current)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 669 408
Level 2 | Marketable securities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0 0
Level 2 | Financial assets (current and non-current)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,019 905
Level 3 | Financial liabilities (current and non-current)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 90 82
Level 3 | Marketable securities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0 0
Level 3 | Financial assets (current and non-current)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 5 $ 4