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Operating Information by Segment and Geographic Area - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($) project $ / shares	Sep. 30, 2025 USD ($) project $ / shares	Sep. 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
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares		$ 0.30
Number of infrastructure projects | project	3	3
Urban Solutions | LBJ
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost	$ 25	$ 25
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares	$ 0.15	$ 0.15
Energy Solutions
Segment Reporting Information [Line Items]
Litigation settlement from arbitration ruling		$ 31	$ 57
Litigation settlement cost per share (in dollars per share) | $ / shares		$ 0.13	$ 0.23
Energy Solutions | Santos Project
Segment Reporting Information [Line Items]
Reversal of revenue due to court ruling, amount repaid to customers	$ 653	$ 653
Reversal of revenue due to court ruling, per share amount repaid to customers (in dollars per share) | $ / shares	$ 3.99	$ 3.99
Mission Solutions
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost		$ 28
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares		$ 0.16

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- Definition

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

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- Definition

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

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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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