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LEASES - Lease Future Payments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]      
2021 $ 68    
2022 53    
2023 45    
2024 35    
2025 34    
Thereafter 121    
Total 356    
Less: Imputed interest 77    
Present value of remaining lease payments 279 $ 293 $ 302
Less: Current portion 52 53  
Non-current portion $ 227 $ 240