Segments and Geographic Information Segment and Geographic Information ( Revenue by Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 2,431	$ 2,625	$ 2,483	$ 2,650	$ 2,622	$ 2,837	$ 2,537	$ 2,740	$ 10,189	$ 10,736	$ 10,530
US and Utilities SBU
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									4,058	4,230
South America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									3,208	3,533
MCAC [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,882	1,728
EURASIA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,047	1,255
Corporate and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									(6)	(10)
Corporate, Non-Segment [Member] | Corporate and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									46	41	35
Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									(52)	(51)	(28)
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									10,189	10,736	10,530
Operating Segments [Member] | US and Utilities SBU
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									4,058	4,230	4,162
Operating Segments [Member] | South America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									3,208	3,533	3,252
Operating Segments [Member] | MCAC [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,882	1,728	1,519
Operating Segments [Member] | EURASIA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									$ 1,047	$ 1,255	$ 1,590