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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Inputs (Details) - Recurring fair value measurement - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 893 $ 750
Financial liabilities (current and non-current) 309 440
Level 1 | Marketable securities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 191 85
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 | 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 653 617
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 49 48
Financial liabilities (current and non-current) | Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 0 0
Financial liabilities (current and non-current) | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 207 351
Financial liabilities (current and non-current) | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) $ 102 $ 89