v3.26.1
Business Segment Information (Schedule of Operations by Reportable Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 03, 2026
Jul. 04, 2025
Jul. 03, 2026
Jul. 04, 2025
Jan. 02, 2026
Segment Reporting [Line Items]          
Revenues $ 1,984 $ 1,952 $ 3,907 $ 3,970  
Cost of revenues (1,691) (1,662) (3,349) (3,380)  
Gross profit 293 290 558 590  
Equity in earnings of unconsolidated affiliates 52 51 103 93  
Selling, general and administrative expenses (143) (146) (262) (286)  
Spin-off costs and other charges (31) 0 (46) 0  
Other operating income (expense) 1 (1) (1) (1)  
Operating income 172 194 352 396  
Interest expense (35) (41) (72) (82)  
Other non-operating income (expense) (2) (8) (2) (5)  
Income (loss) from continuing operations before income taxes 135 145 278 309  
Provision for income taxes (38) (39) (78) (82)  
Net income (loss) from continuing operations 97 106 200 227  
Less: Net income (loss) attributable to noncontrolling interests included in continuing operations 2 1 2 2  
Net income attributable to KBR from continuing operations 95 105 198 225  
Depreciation and amortization 42 45 83 86  
Purchases of property, plant, and equipment (16) (14) (28) (16)  
Total assets 6,667   6,667   $ 6,584
MTS          
Segment Reporting [Line Items]          
Revenues 1,308 1,336 2,604 2,717  
Cost of revenues (1,120) (1,168) (2,247) (2,380)  
Gross profit 188 168 357 337  
Equity in earnings of unconsolidated affiliates 11 8 21 15  
Selling, general and administrative expenses (69) (68) (136) (132)  
Spin-off costs and other charges (15)   (16)    
Other operating income (expense) 1 0 1 1  
Operating income 116 108 227 221  
Interest expense 0 0 0 0  
Other non-operating income (expense) 0 (2) 0 (3)  
Income (loss) from continuing operations before income taxes 116 106 227 218  
Provision for income taxes 0 0 0 0  
Net income (loss) from continuing operations 116 106 227 218  
Less: Net income (loss) attributable to noncontrolling interests included in continuing operations 0 (1) 0 (1)  
Net income attributable to KBR from continuing operations 116 107 227 219  
Depreciation and amortization 24 27 49 53  
Purchases of property, plant, and equipment (5) (10) (12) (10)  
Total assets 3,748   3,748   3,848
STS          
Segment Reporting [Line Items]          
Revenues 676 616 1,303 1,253  
Cost of revenues (571) (494) (1,102) (1,000)  
Gross profit 105 122 201 253  
Equity in earnings of unconsolidated affiliates 41 43 82 78  
Selling, general and administrative expenses (43) (40) (65) (79)  
Spin-off costs and other charges (1)   (2)    
Other operating income (expense) 1 0 0 0  
Operating income 103 125 216 252  
Interest expense 0 0 0 0  
Other non-operating income (expense) 0 1 0 1  
Income (loss) from continuing operations before income taxes 103 126 216 253  
Provision for income taxes 0 0 0 0  
Net income (loss) from continuing operations 103 126 216 253  
Less: Net income (loss) attributable to noncontrolling interests included in continuing operations 2 2 2 3  
Net income attributable to KBR from continuing operations 101 124 214 250  
Depreciation and amortization 11 11 21 20  
Purchases of property, plant, and equipment (2) (2) (3) (2)  
Total assets 2,026   2,026   1,769
Corporate          
Segment Reporting [Line Items]          
Revenues 0 0 0 0  
Cost of revenues 0 0 0 0  
Gross profit 0 0 0 0  
Equity in earnings of unconsolidated affiliates 0 0 0 0  
Selling, general and administrative expenses (31) (38) (61) (75)  
Spin-off costs and other charges (15)   (28)    
Other operating income (expense) (1) (1) (2) (2)  
Operating income (47) (39) (91) (77)  
Interest expense (35) (41) (72) (82)  
Other non-operating income (expense) (2) (7) (2) (3)  
Income (loss) from continuing operations before income taxes (84) (87) (165) (162)  
Provision for income taxes (38) (39) (78) (82)  
Net income (loss) from continuing operations (122) (126) (243) (244)  
Less: Net income (loss) attributable to noncontrolling interests included in continuing operations 0 0 0 0  
Net income attributable to KBR from continuing operations (122) (126) (243) (244)  
Depreciation and amortization 7 7 13 13  
Purchases of property, plant, and equipment (9) $ (2) (13) $ (4)  
Total assets $ 893   $ 893   $ 967