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Segments (Details) $ in Millions	3 Months Ended
Segments (Details) $ in Millions	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of strategic business units \| segment	4
Number of reportable segments \| segment	4
Revenue
Total Revenue	$ 2,740
Adjusted PTC
Adjusted Pretax Contribution	288	$ 190
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative losses (gains)	12	(1)
Unrealized foreign currency transaction losses (gains)	(3)	(9)
Disposition/acquisition losses (gains)	(778)	52
Impairment losses	0	168
Extinguishment of debt losses (gains)	171	(16)
Pretax contribution	883	(4)
Net equity in earnings of affiliates	11	7
Less: Income (loss) from continuing operations before taxes, attributable to noncontrolling interests	(126)	(168)
Income (loss) from continuing operations before taxes and equity in earnings of affiliates	998	157
Restructuring Costs	3	0
Assets
Total Assets	32,573		$ 33,112
Operating Segments [Member]
Revenue
Total Revenue	2,740	2,581
Adjusted PTC
Adjusted Pretax Contribution	288	190
Intersegment Eliminations [Member]
Revenue
Total Revenue	(18)	(4)
US and Utilities [Domain]
Revenue
Total Revenue	1,027
Assets
Total Assets	11,633		11,297
US and Utilities [Domain] \| Operating Segments [Member]
Revenue
Total Revenue	1,027	1,047
Adjusted PTC
Adjusted Pretax Contribution	120	61
MCAC [Member]
Revenue
Total Revenue	408
Assets
Total Assets	4,322		4,087
MCAC [Member] \| Operating Segments [Member]
Revenue
Total Revenue	408	348
Adjusted PTC
Adjusted Pretax Contribution	53	46
EURASIA [Member]
Revenue
Total Revenue	419
Assets
Total Assets	4,855		4,557
EURASIA [Member] \| Operating Segments [Member]
Revenue
Total Revenue	419	429
Adjusted PTC
Adjusted Pretax Contribution	83	77
Corporate Other And Other Eliminations [Member]
Revenue
Total Revenue	(9)
Assets
Total Assets	292		263
Corporate Other And Other Eliminations [Member] \| Operating Segments [Member]
Revenue
Total Revenue	9	14
Adjusted PTC
Adjusted Pretax Contribution	(104)	(121)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets
Total Assets	358		2,034
South America [Member]
Revenue
Total Revenue	895
Assets
Total Assets	11,113		$ 10,874
South America [Member] \| Operating Segments [Member]
Revenue
Total Revenue	895	747
Adjusted PTC
Adjusted Pretax Contribution	$ 136	$ 127