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COMMITMENTS AND CONTINGENCIES - Schedule of Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Leases      
2021 $ 120    
2022 70    
2023 33    
2024 27    
2025 7    
Thereafter 25    
Total future minimum payments 282    
Less: imputed interest (21)    
Total lease liabilities 261    
Current portion 116 $ 169  
Non-current portion 145    
Finance Leases      
2021 3    
2022 3    
2023 3    
2024 4    
2025 4    
Thereafter 29    
Total future minimum payments 46    
Less: imputed interest (8)    
Total lease liabilities 38 48  
Current portion 2    
Non-current portion 36    
Purchase Obligations      
2021 236    
2022 203    
2023 203    
2024 160    
2025 159    
Thereafter 600    
Total future minimum payments 1,561    
Total costs under take or pay and throughout obligation $ 120 $ 111 $ 132
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:DeferredCostsAndOtherAssets us-gaap:DeferredCostsAndOtherAssets  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent