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Fair Value of Financial Instruments and Risk Management (Sale of Receivables - Third-party Financial Institutions) (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 04, 2025	Jun. 28, 2024
Transfer of Financial Assets Accounted for as Sales [Roll Forward]
Beginning balance	$ 106	$ 135
Sale of receivables	1,500	1,555
Settlement of receivables	(1,542)	(1,564)
Cash collected, not yet remitted	0	(4)
Outstanding balances sold to financial institutions	$ 64	$ 122

X

- Definition

Transfer Of Financial Assets Accounted For As Sales, Cash Collection, Not Yet Remitted, Amount Derecognized

+ References

No definition available.

+ Details

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X

- Definition

Transfer of Financial Assets Accounted for as Sales

+ References

No definition available.

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X

- Definition

Transfer of Financial Assets Accounted for as Sales, Settlement Of Receivables, Amount Derecognized

+ References

No definition available.

+ Details

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Namespace Prefix:	kbr_
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X

- Definition

Amount of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4D
-Subparagraph (a)
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4D

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X

- Definition

Amount, before counterparty netting, of cash proceeds received in transfers of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4D
-Subparagraph (b)
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4D

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