Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Total Revenue	$ 2,545	$ 2,625	$ 7,100	$ 7,758
Number of strategic business units | segment			4
Number of reportable segments | segment			4
Adjusted PTC
Adjusted Pretax Contribution	331	426	$ 819	938
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative losses (gains)	(26)	(69)	(24)	(78)
Unrealized foreign currency transaction losses (gains)	4	(31)	7	(49)
Disposition/acquisition losses (gains)	(100)	17	(130)	3
Impairment losses	(657)	(1)	(878)	(124)
Extinguishment of debt losses (gains)	(55)	(38)	(103)	(95)
Gain (Loss) on Contract Termination	(72)	0	(72)	0
Pretax contribution	(431)	304	(237)	595
Net equity in earnings (losses) of affiliates	(112)	4	(106)	3
Less: Income (loss) from continuing operations before taxes, attributable to noncontrolling interests	(197)	124	40	304
Income (loss) from continuing operations before taxes and equity in earnings of affiliates	(516)	424	(91)	896
Assets
Total Assets	34,267		34,267		$ 33,648
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenue	(52)	(14)	(198)	(43)
Adjusted PTC
Adjusted Pretax Contribution	4	(9)	11	(10)
US and Utilities [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	1,061	1,130	2,945	3,125
Adjusted PTC
Adjusted Pretax Contribution	185	187	313	427
Assets
Total Assets	14,222		14,222		13,334
South America [Member]
Segment Reporting Information [Line Items]
Total Revenue	850	828	2,273	2,438
South America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	850	828	2,273	2,438
Adjusted PTC
Adjusted Pretax Contribution	122	139	381	360
Assets
Total Assets	11,088		11,088		11,314
MCAC [Member]
Segment Reporting Information [Line Items]
Total Revenue	442	470	1,255	1,398
MCAC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	442	470	1,255	1,398
Adjusted PTC
Adjusted Pretax Contribution	57	185	201	298
Assets
Total Assets	5,061		5,061		4,770
EURASIA [Member]
Segment Reporting Information [Line Items]
Total Revenue	195	197	634	801
EURASIA [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	195	197	634	801
Adjusted PTC
Adjusted Pretax Contribution	40	19	133	114
Assets
Total Assets	3,626		3,626		3,990
Corporate Other And Other Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenue	(3)	0	(7)	(4)
Corporate Other And Other Eliminations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	49	14	191	39
Adjusted PTC
Adjusted Pretax Contribution	(77)	$ (95)	(220)	$ (251)
Assets
Total Assets	$ 270		$ 270		$ 240