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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