Operating Information by Segment and Geographic Area - Total Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total assets	$ 6,870	$ 7,089
Reportable segments | Energy Solutions
Segment Reporting Information [Line Items]
Total assets	979	1,158
Reportable segments | Urban Solutions
Segment Reporting Information [Line Items]
Total assets	1,052	906
Reportable segments | Mission Solutions
Segment Reporting Information [Line Items]
Total assets	500	764
Reportable segments | Other
Segment Reporting Information [Line Items]
Total assets	679	667
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 3,660	$ 3,594