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Operating Information by Segment and Geographic Area - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) project $ / shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares
Santos Ltd | Pending litigation
Segment Reporting Information [Line Items]
Reversal of revenue due to court ruling, amount repaid to customers | $	$ 643
Urban Solutions
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost | $	$ 108
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares	$ 0.61
Urban Solutions | LAX Automated People Mover project
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost | $		$ 59
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares		$ 0.34
Energy Solutions
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost | $		$ 66
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares		$ 0.26
Energy Solutions | Santos Project
Segment Reporting Information [Line Items]
Reversal of revenue due to court ruling, per share amount repaid to customers (in dollars per share) | $ / shares	$ 3.89
Energy Solutions | Upstream Project
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost | $			$ 91
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares			$ 0.53
Mission Solutions | Weapons Facility Project
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost | $		$ 30
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares		$ 0.17
Consolidated revenue | Customer concentration | Mission Solutions
Segment Reporting Information [Line Items]
Concentration risk (as a percentage)	17.00%	16.00%	9.00%
Single customer | Consolidated revenue | Customer concentration | Urban Solutions
Segment Reporting Information [Line Items]
Concentration risk (as a percentage)	15.00%
Number of infrastructure projects | project	3
Single customer | Consolidated revenue | Customer concentration | Energy Solutions
Segment Reporting Information [Line Items]
Concentration risk (as a percentage)			10.00%

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

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
-Paragraph 42
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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