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LEASES - Lease Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Leases:    
2021 $ 96  
2022 95  
2023 85  
2024 26  
2025 29  
Thereafter 195  
Total lease payments 526  
Less: Interest (176)  
Present value of lease liabilities $ 350 $ 415