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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