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DIVESTITURES - Income Statement (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Impairment charge for goodwill |  |  |  |  | $ 0 | $ 0 | $ 0
Income from discontinued operations, net | $ (37,000,000) | $ 397,000,000 | $ 295,000,000 |  | 414,000,000 | 296,000,000 | 98,000,000
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net sales |  |  |  |  | 101,000,000 | 1,528,000,000 | 1,705,000,000
Cost of sales |  |  |  |  | 78,000,000 | 1,184,000,000 | 1,343,000,000
Gross profit |  |  |  |  | 23,000,000 | 344,000,000 | 362,000,000
Selling, general and administrative expenses |  |  |  |  | 28,000,000 | 232,000,000 | 228,000,000
Impairment charge for goodwill |  |  |  |  | 0 | 7,000,000 | 0
Other income (expense), net |  |  |  |  | 0 | 1,000,000 | 1,000,000
(Loss) income from discontinued operations |  |  |  |  | (5,000,000) | 106,000,000 | 135,000,000
Gain on disposal of discontinued operations, net |  |  |  |  | 602,000,000 | 298,000,000 | 0
Income before income tax |  |  |  |  | 597,000,000 | 404,000,000 | 135,000,000
Income tax expense |  |  |  |  | (183,000,000) | (108,000,000) | (37,000,000)
Income from discontinued operations, net |  |  |  |  | 414,000,000 | 296,000,000 | 98,000,000
UK Window Group | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Noncash goodwill impairment |  |  |  | $ 7,000,000 |  |  |
Milgard and UKWG | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income before income tax |  |  |  |  | 2,000,000 | (1,000,000) | 40,000,000
Cabinetry Products | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income before income tax |  |  |  |  | $ (7,000,000) | $ 107,000,000 | $ 95,000,000

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