Segments and Geographic Information Segment and Geographic Information ( Revenue by Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 2,770	$ 3,036	$ 2,700	$ 2,635	$ 2,560	$ 2,545	$ 2,217	$ 2,338	$ 11,141	$ 9,660	$ 10,189
US and Utilities SBU
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									4,335	3,918	4,058
South America
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									3,541	3,159	3,208
MCAC [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									2,157	1,766	1,882
EURASIA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,123	828	1,047
Corporate and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									(15)	(11)	(6)
Corporate, Non-Segment [Member] | Corporate and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									116	231	46
Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									(131)	(242)	(52)
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									11,141	9,660	10,189
Operating Segments [Member] | US and Utilities SBU
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									4,335	3,918	4,058
Operating Segments [Member] | South America
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									3,541	3,159	3,208
Operating Segments [Member] | MCAC [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									2,157	1,766	1,882
Operating Segments [Member] | EURASIA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									$ 1,123	$ 828	$ 1,047