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LEASES - Summary of Undiscounted Cash Flows Owed by the Company to Lessors Pursuant to Contractual Agreements (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 9
2021 5
2022 2
2023 0
2024 0
Thereafter 0
Total lease payments 16
Less: interest 1
Present value of lease liabilities $ 15