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Operating Information by Segment and Geographic Area - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2025 USD ($) project $ / shares	Jun. 30, 2025 USD ($) project $ / shares	Jun. 30, 2024 USD ($) $ / shares
Disposal Group, Not Discontinued Operations | Stork Holding B V
Segment Reporting Information [Line Items]
Gain on sale		$ 7	$ 11
Urban Solutions
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost	$ 54	$ 54
Change in forecast estimate in project cost (in dollars per share) | $ / shares	$ 0.30	$ 0.30
Number of infrastructure projects | project	3	3
Energy Solutions
Segment Reporting Information [Line Items]
Litigation settlement from arbitration ruling	$ 31	$ 31	$ 39
Litigation settlement cost per share (in dollars per share) | $ / shares	$ 0.13	$ 0.13	$ 0.16
Mission Solutions
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost		$ 28
Litigation settlement cost per share (in dollars per share) | $ / shares		$ 0.16

X

- Definition

Represents the increase (decrease) in the estimated project cost based on forecast revisions.

+ References

No definition available.

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- Definition

Change In Forecast Estimate Increase Decrease In Project Cost Per Diluted Share

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- Definition

Represents the increase (decrease) in estimated petrochemical project cost based on forecast revisions, in dollars per diluted share.

+ References

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- Definition

Number of Infrastructure Projects

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- Definition

The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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- Definition

Amount awarded from other party in judgment or settlement of litigation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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