Operating Information by Segment and Geographic Area - Total Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Segment reporting information
Total assets	$ 6,492	$ 7,089
Reportable segments | Energy Solutions
Segment reporting information
Total assets	919	1,158
Reportable segments | Urban Solutions
Segment reporting information
Total assets	950	906
Reportable segments | Mission Solutions
Segment reporting information
Total assets	612	764
Reportable segments | Other
Segment reporting information
Total assets	707	667
Corporate
Segment reporting information
Total assets	$ 3,304	$ 3,594