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Operating Information by Segment and Geographic Area - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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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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