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LEASES - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
2021 $ 168  
2022 122  
2023 74  
2024 50  
2025 35  
Thereafter 136  
Total remaining lease payments 585  
Less: Imputed interest (60)  
Total operating lease liabilities $ 525 $ 623