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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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