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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Plants, Property and Equipment, Net (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accumulated depreciation | $ 3,800 | $ 3,800
Non-cash additions | $ 11 | $ 11

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