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Discontinued Operations (Components of Net Income (Loss) Attributable to KBR From Discontinued Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 03, 2025 | Sep. 27, 2024 | Oct. 03, 2025 | Sep. 27, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net income (loss) from discontinued operations, net of tax | $ (1) | $ 0 | $ (55) | $ 1
Less: Net income (loss) attributable to noncontrolling interests included in discontinued operations | 0 | 0 | (18) | 1
Net loss attributable to KBR from discontinued operations | (1) | 0 | (37) | 0
Abandonment | HomeSafe |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenues | 3 | 10 | 67 | 18
Cost of revenues | (3) | (9) | (82) | (16)
Gross profit (loss) | 0 | 1 | (15) | 2
Selling, general and administrative expenses | (2) | 0 | (29) | 0
Loss on disposal | 0 | 0 | (22) | 0
Other | 0 | (1) | 0 | (1)
Operating income (loss) | (2) | 0 | (66) | 1
Income (loss) from discontinued operations before income taxes | (2) | 0 | (66) | 1
Provision for income taxes | 1 | 0 | 11 | 0
Net income (loss) from discontinued operations, net of tax | (1) | 0 | (55) | 1
Less: Net income (loss) attributable to noncontrolling interests included in discontinued operations | 0 | 0 | (18) | 1
Net loss attributable to KBR from discontinued operations | $ (1) | $ 0 | (37) | $ 0
Asset impairments related to property, plant and equipment |  |  | 64 |
Asset write-offs |  |  | 30 |
Elimination of other liabilities |  |  | $ 72 |

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