Operating Information by Segment and Geographic Area - Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 4,094	$ 3,963	$ 12,055	$ 11,654
Total segment profit	49	218	277	172
G&A	(37)	(56)	(147)	(177)
Foreign currency gain (loss)	(2)	23	58	(62)
Earnings before taxes	86	260	391	291
Continuing Operations
Segment Reporting Information [Line Items]
G&A	(37)	(56)	(147)	(177)
Foreign currency gain (loss)	(2)	23	58	(62)
Interest income (expense), net	37	42	114	120
Earnings (loss) attributable to NCI	(29)	(25)	(63)	(42)
Earnings before taxes	86	260	391	291
Continuing Operations | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	4,094	3,963	12,055	11,654
Total segment profit	117	276	429	452
Continuing Operations | Consolidation, Eliminations
Segment Reporting Information [Line Items]
Total revenue	70	77	226	221
Continuing Operations | Energy Solutions | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	1,428	1,553	4,456	4,886
Total segment profit	50	177	193	355
Continuing Operations | Urban Solutions | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	1,931	1,431	5,240	3,842
Total segment profit	68	66	223	121
Continuing Operations | Mission Solutions | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	635	655	1,940	2,009
Total segment profit	45	38	108	84
Continuing Operations | Other | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	100	324	419	917
Total segment profit	$ (46)	$ (5)	$ (95)	$ (108)