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Assets held for sale and discontinued operations - Results of discontinued operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income from discontinued operations, net of income tax expense | $ 0 | $ 1,190 | $ 179
Discontinued Operations | Building Envelope Business |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Total revenues |  | 645 | 1,775
Operating income |  | 89 | 239
Gain on divestiture before income taxes |  | 1,471 | 0
Income from discontinued operations before income tax expense |  | 1,560 | 239
Income tax expense |  | (370) | (60)
Income from discontinued operations, net of income tax expense |  | $ 1,190 | $ 179

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