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Discontinued Operations (Components of Net Income (Loss) Attributable to KBR From Discontinued Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 04, 2025
Jun. 28, 2024
Jul. 04, 2025
Jun. 28, 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 $ (48) $ 1 $ (54) $ 1
Less: Net income (loss) attributable to noncontrolling interests included in discontinued operations (16) 1 (18) 1
Net loss attributable to KBR from discontinued operations (32) 0 (36) 0
Abandonment | HomeSafe        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues 27 8 64 8
Cost of revenues (40) (7) (79) (7)
Gross profit (loss) (13) 1 (15) 1
Selling, general and administrative expenses (22) 0 (27) 0
Loss on disposal (22) 0 (22) 0
Operating income (loss) (57) 1 (64) 1
Income (loss) from discontinued operations before income taxes (57) 1 (64) 1
Provision for income taxes 9 0 10 0
Net income (loss) from discontinued operations, net of tax (48) 1 (54) 1
Less: Net income (loss) attributable to noncontrolling interests included in discontinued operations (16) 1 (18) 1
Net loss attributable to KBR from discontinued operations (32) 0 (36) 0
Asset impairments related to property, plant and equipment 64 64 64 64
Asset write-offs 30 30 30 30
Elimination of other liabilities $ 72 $ 72 $ 72 $ 72