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Retirement Benefits (Tables)

12 Months Ended

Jan. 02, 2026

Retirement Benefits [Abstract]

Schedule of Change in Projected Benefit Obligations

Plan assets, expenses and obligations for our defined benefit pension plans are presented in the following tables.

			Overfunded												Underfunded
			United States						International						United States						International
Dollars in millions			Fiscal 2025
Change in projected benefit obligations:
Projected benefit obligations at beginning of period			$	47					$	1,111					$	8					$	4
Service cost			—						1						—						—
Interest cost			2						63						1						—
Foreign currency exchange rate changes			—						84						—						—
Actuarial (gain) loss(1)			1						(12)						—						—
Benefits paid			(4)						(70)						(1)						—
Other			—						(1)						—						—
Projected benefit obligations at end of period			$	46					$	1,176					$	8					$	4
Change in plan assets:
Fair value of plan assets at beginning of period			$	46					$	1,193					$	8					$	—
Actual return on plan assets			6						48						1						—
Employer contributions			2						1						—						—
Foreign currency exchange rate changes			—						91						—						—
Benefits paid			(4)						(70)						(1)						—
Other			(1)						(1)						—						—
Fair value of plan assets at end of period			$	49					$	1,262					$	8					$	—
Funded status			$	3					$	86					$	—					$	(4)

(1) Actuarial (gains) losses primarily driven by inflation.

			Overfunded												Underfunded
			United States						International						United States						International
Dollars in millions			Fiscal 2024
Change in projected benefit obligations:
Projected benefit obligations at beginning of period			$	—					$	1,301					$	58					$	4
Service cost			—						1						—						—
Interest cost			—						61						3						—
Foreign currency exchange rate changes			—						(23)						—						—
Actuarial gain(1)			—						(162)						(1)						—
Benefits paid			—						(67)						(5)						—
Projected benefit obligations at end of period			$	—					$	1,111					$	55					$	4
Change in plan assets:
Fair value of plan assets at beginning of period			$	—					$	1,295					$	53					$	—
Actual return on plan assets			—						(72)						5						—
Employer contributions			—						61						1						—
Foreign currency exchange rate changes			—						(24)						—						—
Benefits paid			—						(67)						(5)						—
Fair value of plan assets at end of period			$	—					$	1,193					$	54					$	—
Funded status			$	—					$	82					$	(1)					$	(4)

(1) Actuarial gains primarily driven by change in discount rates.

Schedule of Amounts Recognized on Consolidated Balance Sheet

			United States						International						United States						International
Dollars in millions			Fiscal 2025												Fiscal 2024
Amounts recognized on the consolidated balance sheets
Pension assets			$	3					$	86					$	—					$	82
Other liabilities			$	—					$	(4)					$	(1)					$	(4)

Schedule of Components of Net Periodic Benefit Cost

Net periodic pension cost for our defined benefit plans included the following components:

			United States						International						United States						International						United States						International
Dollars in millions			Fiscal 2025												Fiscal 2024												Fiscal 2023
Components of net periodic benefit cost
Service cost			$	—					$	1					$	—					$	1					$	—					$	1
Interest cost			3						63						3						61						3						61
Expected return on plan assets			(3)						(112)						(3)						(113)						(3)						(102)
Prior service cost amortization			—						1						—						1						—						1
Recognized actuarial loss			1						4						1						3						1						—
Net periodic (benefit) cost			$	1					$	(43)					$	1					$	(47)					$	1					$	(39)

Schedule of Accumulated Other Comprehensive Loss

The amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost at January 2, 2026 and January 3, 2025, net of tax were as follows:

			United States						International						United States						International
Dollars in millions			Fiscal 2025												Fiscal 2024
Unrecognized actuarial loss, net of tax of $6 and $238, $6 and $226, respectively			$	10					$	678					$	12					$	643
Total in accumulated other comprehensive loss			$	10					$	678					$	12					$	643

Schedule of Weighted-Average Assumptions

The weighted-average assumptions used to determine net periodic benefit cost were as follows:

			United States						International						United States						International						United States						International
			Fiscal 2025												Fiscal 2024												Fiscal 2023
Discount rate			5.32		%				5.54		%				4.70		%				4.79		%				4.91		%				5.00		%
Expected return on plan assets			6.64		%				6.80		%				6.64		%				6.70		%				6.63		%				5.92		%

The weighted-average assumptions used to determine benefit obligations at the measurement date were as follows:

			United States						International						United States						International
			Fiscal 2025												Fiscal 2024
Discount rate			4.97		%				5.60		%				5.32		%				5.54		%

Schedule of Allocation of Plan Assets

The target asset allocation for our U.S. and International plans for fiscal 2026 is as follows:

			Fiscal 2026 Targeted
			United States						International
Equity funds and securities			52		%				37		%
Fixed income funds and securities			39		%				46		%
Real estate funds			1		%				7		%
Other			8		%				10		%
Total			100		%				100		%

The range of targeted asset allocations for our International plans for fiscal 2026 and fiscal 2025, by asset class, are as follows:

International Plans			Fiscal 2026 Targeted Percentage Range												Fiscal 2025 Targeted Percentage Range
			Minimum						Maximum						Minimum						Maximum
Equity funds and securities			29		%				45		%				36		%				55		%
Fixed income funds and securities			37		%				55		%				28		%				42		%
Real estate funds			6		%				8		%				6		%				10		%
Other			8		%				12		%				10		%				15		%

The range of targeted asset allocations for our U.S. plans for fiscal 2026 and fiscal 2025, by asset class, are as follows:

Domestic Plans			Fiscal 2026 Targeted Percentage Range												Fiscal 2025 Targeted Percentage Range
			Minimum						Maximum						Minimum						Maximum
Equity funds and securities			41		%				62		%				41		%				62		%
Fixed income funds and securities			31		%				47		%				31		%				47		%
Real estate funds			1		%				1		%				1		%				1		%
Other			7		%				10		%				7		%				10		%

A summary of total investments for KBR’s defined benefit pension plan assets measured at fair value is presented below.

			Fair Value Measurements at Reporting Date
Dollars in millions			Total						Level 1						Level 2						Level 3
Asset Category at January 2, 2026
United States plan assets
Investments measured at net asset value (a)			$	57					$	—					$	—					$	—
Total United States plan assets			$	57					$	—					$	—					$	—
International plan assets
Equities			$	413					$	—					$	356					$	57
Fixed income			606						—						606						—
Real estate			2						—						—						2
Cash and cash equivalents			99						99						—						—
Other			56						—						—						56
Investments measured at net asset value (a)			86						—						—						—
Total international plan assets			$	1,262					$	99					$	962					$	115
Total plan assets at January 2, 2026			$	1,319					$	99					$	962					$	115

			Fair Value Measurements at Reporting Date
Dollars in millions			Total						Level 1						Level 2						Level 3
Asset Category at January 3, 2025
United States plan assets
Investments measured at net asset value (a)			$	54					$	—					$	—					$	—
Total United States plan assets			$	54					$	—					$	—					$	—
International plan assets
Equities			$	433					$	—					$	379					$	54
Fixed income			564						—						564						—
Real estate			1						—						—						1
Cash and cash equivalents			39						39						—						—
Other			56						—						—						56
Investments measured at net asset value (a)			100						—						—						—
Total international plan assets			$	1,193					$	39					$	943					$	111
Total plan assets at January 3, 2025			$	1,247					$	39					$	943					$	111

(a) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.

Schedule of Fair Value Measurement of Plan Assets

The fair value measurement of plan assets using significant unobservable inputs (Level 3) changed each year due to the following:

Dollars in millions			Total						Equities						Fixed Income						Real Estate						Other
International plan assets
Balance as of December 29, 2023			$	114					$	51					$	—					$	1					$	62
Return on assets held at end of year			6						8						—						—						(2)
Purchases, sales and settlements, net			(7)						(4)						—						—						(3)
Foreign exchange impact			(2)						(1)						—						—						(1)
Balance as of January 3, 2025			$	111					$	54					$	—					$	1					$	56
Return on assets held at end of year			(6)						2						1						—						(9)
Return on assets sold during the year			—						(1)						(1)						—						2
Purchases, sales and settlements, net			1						(2)						—						—						3
Foreign exchange impact			9						4						—						1						4
Balance as of January 2, 2026			$	115					$	57					$	—					$	2					$	56

Schedule of Expected Benefit Payments

Benefit payments. The following table presents the expected benefit payments over the next 10 years.

			Pension Benefits
Dollars in millions			United States						International
Fiscal 2026			$	6					$	73
Fiscal 2027			$	5					$	75
Fiscal 2028			$	5					$	78
Fiscal 2029			$	5					$	80
Fiscal 2030			$	5					$	81
Fiscals 2031-2035			$	20					$	417

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