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LEASES - Liability Maturity Schedule (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2021 $ 149  
2022 147  
2023 130  
2024 111  
2025 90  
Thereafter 294  
Total lease payments 921  
Less: Interest 86  
Present value of lease liabilities $ 835 $ 721