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SUPPLEMENTAL FINANCIAL INFORMATION - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Property, Plant and Equipment [Line Items] |  |
Right-of-use asset obtained in exchange for operating lease liability | $ 69 | $ 42
Right-of-use asset obtained in exchange for finance lease liability |  | 7
Property, Plant and Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Capital expenditures incurred but not yet paid | $ 49 | $ 48

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