Operating Information by Segment and Geographic Area - Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 3,734	$ 3,752
Total segment profit (loss)	52	(141)
G&A	(59)	(62)
Foreign currency gain (loss)	12	(41)
Earnings (loss) before taxes	91	(100)
Continuing Operations
Segment Reporting Information [Line Items]
G&A	(59)	(62)
Foreign currency gain (loss)	12	(41)
Interest income (expense), net	39	41
Earnings (loss) attributable to NCI	(19)	(23)
Earnings (loss) before taxes	91	(100)
Continuing Operations | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	3,734	3,752
Total segment profit (loss)	118	(15)
Continuing Operations | Consolidation, Eliminations
Segment Reporting Information [Line Items]
Total revenue	81	69
Continuing Operations | Energy Solutions | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	1,432	1,612
Total segment profit (loss)	68	88
Continuing Operations | Urban Solutions | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	1,479	1,208
Total segment profit (loss)	50	(20)
Continuing Operations | Mission Solutions | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	601	649
Total segment profit (loss)	22	7
Continuing Operations | Other | Reportable Segments
Segment Reporting Information [Line Items]
Total revenue	222	283
Total segment profit (loss)	$ (22)	$ (90)