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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation Techniques and Significant Inputs (Details) - Recurring fair value measurement - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 1,269 $ 1,085
Financial liabilities (current and non-current) 641 931
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) 185 251
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) 364 561
Other contracts | Level 3 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities (current and non-current) 92 119
Marketable securities | Level 1 | Quoted bid prices    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 687 526
Foreign currency forward contracts | Level 2 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 115 115
Interest rate swaps & other | Level 2 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 461 438
Other contracts | Level 3 | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 6 $ 6