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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation Techniques and Significant 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
Foreign currency forward contracts | Level 2 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 52 97
Interest rate swaps & other | Level 2 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 617 311
Other contracts | Level 3 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 90 82
Marketable securities | Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 306 142
Marketable securities | Level 1 | Quoted bid prices    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 306 142
Marketable securities | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0 0
Marketable securities | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0 0
Foreign currency forward contracts | Level 2 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 157 140
Interest rate swaps & other | Level 2 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 862 765
Other contracts | Level 3 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 5 $ 4