Operating Information by Segment and Geographic Area - Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 3,612	$ 3,503	$ 10,034	$ 10,534
Total segment profit (loss)	(11)	101	190	(7)
G&A	(30)	(44)	(146)	(144)
Impairment			63
Foreign currency gain (loss)	34	37	51	(4)
Earnings (loss) from Cont Ops before taxes	3	68	194	(70)
Continuing Operations
Segment Reporting Information [Line Items]
G&A	(30)	(44)	(146)	(144)
Impairment	0	(5)	63	(153)
Foreign currency gain (loss)	34	37	51	(4)
Interest income (expense), net	14	(33)	4	(63)
Earnings (loss) from Cont Ops attributable to NCI	(46)	(3)	(31)	22
Earnings (loss) from Cont Ops before taxes	3	68	194	(70)
Continuing Operations | Reportable segments
Segment Reporting Information [Line Items]
Total revenue	3,612	3,503	10,034	10,534
Total segment profit (loss)	31	116	253	272
Continuing Operations | Energy Solutions | Reportable segments
Segment Reporting Information [Line Items]
Total revenue	1,592	1,365	4,097	3,675
Total segment profit (loss)	59	72	177	184
Continuing Operations | Urban Solutions | Reportable segments
Segment Reporting Information [Line Items]
Total revenue	982	1,015	2,946	3,419
Total segment profit (loss)	(54)	18	(31)	(21)
Continuing Operations | Mission Solutions | Reportable segments
Segment Reporting Information [Line Items]
Total revenue	639	723	1,779	2,184
Total segment profit (loss)	29	28	115	117
Continuing Operations | Other | Reportable segments
Segment Reporting Information [Line Items]
Total revenue	399	400	1,212	1,256
Total segment profit (loss)	$ (3)	$ (2)	$ (8)	$ (8)