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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+ Details

Operating Information by Segment and Geographic Area - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Number Of Reportable Segments Disclosed By Definition Flag			true
Urban Solutions
Segment Reporting [Line Items]
Effect of forecast revision on estimated project cost	$ 44	$ 54	$ 37
Effect of forecast revision on estimated project cost (in dollars per share)	$ 0.23	$ 0.30	$ 0.25
Energy Solutions
Segment Reporting [Line Items]
Effect of forecast revision on estimated project cost		$ 31		$ 31
Effect of forecast revision on estimated project cost (in dollars per share)		$ 0.13		$ 0.13
Mission Solutions
Segment Reporting [Line Items]
Effect of forecast revision on estimated project cost			$ 98	$ 28
Effect of forecast revision on estimated project cost (in dollars per share)			$ 0.68	$ 0.16