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Discontinued Operations (Components of Net Income (Loss) Attributable to KBR From Discontinued Operations) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 02, 2026 | Jan. 03, 2025 | Dec. 29, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net income (loss) from discontinued operations, net of tax | $ (55) | $ 2 | $ (1)
Less: Net income (loss) attributable to noncontrolling interests included in discontinued operations | (19) | 1 | 0
Net income (loss) attributable to KBR from discontinued operations | (36) | 1 | (1)
Abandonment | HomeSafe |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenues | 67 | 32 | 0
Cost of revenues | (83) | (28) | 0
Gross profit (loss) | (16) | 4 | 0
Selling, general and administrative expenses | (30) | (1) | (1)
Loss on disposal | (22) | 0 | 0
Operating income (loss) | (68) | 3 | (1)
Income (loss) from discontinued operations before income taxes | (68) | 3 | (1)
Provision for income taxes | 13 | (1) | 0
Net income (loss) from discontinued operations, net of tax | (55) | 2 | (1)
Less: Net income (loss) attributable to noncontrolling interests included in discontinued operations | (19) | 1 | 0
Net income (loss) attributable to KBR from discontinued operations | (36) | $ 1 | $ (1)
Asset impairments related to property, plant and equipment | 64 |  |
Asset write-offs | 30 |  |
Elimination of other liabilities | $ 72 |  |

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