Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Total Revenue	$ 2,217	$ 2,483	$ 4,555	$ 5,133
Number of strategic business units | segment			4
Number of reportable segments | segment			4
Adjusted PTC
Adjusted Pretax Contribution	238	240	$ 488	512
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative losses (gains)	(14)	(6)	2	(9)
Unrealized foreign currency transaction losses (gains)	12	(7)	3	(18)
Disposition/acquisition losses (gains)	(29)	(5)	(30)	(14)
Impairment losses	(168)	(121)	(221)	(123)
Extinguishment of debt losses (gains)	(44)	(49)	(48)	(57)
Pretax contribution	(5)	52	194	291
Net equity in earnings (losses) of affiliates	8	5	6	(1)
Less: Income (loss) from continuing operations before taxes, attributable to noncontrolling interests	118	71	237	180
Income (loss) from continuing operations before taxes and equity in earnings of affiliates	105	118	425	472
Assets
Total Assets	34,566		34,566		$ 33,648
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenue	(116)	(17)	(146)	(29)
Adjusted PTC
Adjusted Pretax Contribution	11	(2)	7	(1)
US and Utilities [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	913	976	1,884	1,995
Adjusted PTC
Adjusted Pretax Contribution	57	118	128	240
Assets
Total Assets	14,236		14,236		13,334
South America [Member]
Segment Reporting Information [Line Items]
Total Revenue	711	765	1,423	1,610
South America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	711	765	1,423	1,610
Adjusted PTC
Adjusted Pretax Contribution	140	106	259	221
Assets
Total Assets	11,408		11,408		11,314
MCAC [Member]
Segment Reporting Information [Line Items]
Total Revenue	381	478	813	928
MCAC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	381	478	813	928
Adjusted PTC
Adjusted Pretax Contribution	66	63	144	113
Assets
Total Assets	4,993		4,993		4,770
EURASIA [Member]
Segment Reporting Information [Line Items]
Total Revenue	214	265	439	604
EURASIA [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	214	265	439	604
Adjusted PTC
Adjusted Pretax Contribution	49	39	93	95
Assets
Total Assets	3,587		3,587		3,990
Corporate Other And Other Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenue	(2)	(1)	(4)	(4)
Corporate Other And Other Eliminations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenue	114	16	142	25
Adjusted PTC
Adjusted Pretax Contribution	(85)	$ (84)	(143)	$ (156)
Assets
Total Assets	$ 342		$ 342		$ 240