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Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
Segments (Details) $ in Millions	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	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	$ 2,537	$ 2,613	$ 5,277	$ 5,194
Adjusted PTC
Adjusted Pretax Contribution	255	242	543	432
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative losses (gains)	(24)	2	(12)	1
Unrealized foreign currency transaction losses (gains)	52	(24)	49	(33)
Disposition/acquisition losses (gains)	(61)	56	(839)	108
Impairment losses	92	94	92	262
Extinguishment of debt losses (gains)	7	11	178	(5)
Pretax contribution	189	103	1,072	99
Net equity in earnings of affiliates	14	2	25	9
Less: Income (loss) from continuing operations before taxes, attributable to noncontrolling interests	(167)	(125)	(293)	(293)
Income (loss) from continuing operations before taxes and equity in earnings of affiliates	342	226	1,340	383
Restructuring Costs	0	0	3	0
Assets
Total Assets	32,597		32,597		$ 33,112
Operating Segments [Member]
Revenue
Total Revenue	2,537	2,613	5,277	5,194
Adjusted PTC
Adjusted Pretax Contribution	255	242	543	432
Intersegment Eliminations [Member]
Revenue
Total Revenue	(7)	(5)	(25)	(9)
US and Utilities [Domain]
Revenue
Total Revenue	995		2,022
Assets
Total Assets	11,817		11,817		11,297
US and Utilities [Domain] \| Operating Segments [Member]
Revenue
Total Revenue	995	1,046	2,022	2,093
Adjusted PTC
Adjusted Pretax Contribution	76	89	196	150
MCAC [Member]
Revenue
Total Revenue	406		814
Assets
Total Assets	4,335		4,335		4,087
MCAC [Member] \| Operating Segments [Member]
Revenue
Total Revenue	406	375	814	723
Adjusted PTC
Adjusted Pretax Contribution	81	72	134	118
EURASIA [Member]
Revenue
Total Revenue	292		711
Assets
Total Assets	4,659		4,659		4,557
EURASIA [Member] \| Operating Segments [Member]
Revenue
Total Revenue	292	395	711	824
Adjusted PTC
Adjusted Pretax Contribution	55	80	138	157
Corporate Other And Other Eliminations [Member]
Revenue
Total Revenue	(2)		(11)
Assets
Total Assets	423		423		263
Corporate Other And Other Eliminations [Member] \| Operating Segments [Member]
Revenue
Total Revenue	5	6	14	20
Adjusted PTC
Adjusted Pretax Contribution	(74)	(94)	(178)	(215)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets
Total Assets	108		108		2,034
South America [Member]
Revenue
Total Revenue	846		1,741
Assets
Total Assets	11,255		11,255		$ 10,874
South America [Member] \| Operating Segments [Member]
Revenue
Total Revenue	846	796	1,741	1,543
Adjusted PTC
Adjusted Pretax Contribution	$ 117	$ 95	$ 253	$ 222