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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Inputs (Details) - Recurring fair value measurement - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 1,223 $ 1,179
Financial liabilities (current and non-current) 350 373
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 184 173
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) 270 280
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 932 959
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) 80 93
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 $ 107 $ 47