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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Plants, Property and Equipment, Net (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Accumulated depreciation | $ 3,900,000,000 |  | $ 3,900,000,000 |  | $ 3,600,000,000
Depreciation | $ 37,000,000 | $ 33,000,000 | 103,000,000 | $ 97,000,000 |
Property, Plant and Equipment [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Non-cash additions |  |  | 16,000,000 |  | 12,000,000
Forestlands [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Non-cash additions |  |  | $ 0 |  | $ 10,000,000

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