Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	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	$ 2,837	$ 2,693	$ 8,114	$ 7,887
Adjusted PTC
Adjusted Pretax Contribution	327	238	870	670
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative losses (gains)	16	(8)	4	(7)
Unrealized foreign currency transaction losses (gains)	(7)	(21)	42	(54)
Disposition/acquisition losses (gains)	17	1	(822)	109
Impairment losses	80	2	172	264
Extinguishment of debt losses (gains)	(1)	48	177	43
Pretax contribution	222	216	1,294	315
Net equity in earnings of affiliates	6	24	31	33
Less: Income (loss) from continuing operations before taxes, attributable to noncontrolling interests	(116)	(112)	(409)	(405)
Income (loss) from continuing operations before taxes and equity in earnings of affiliates	332	304	1,672	687
Restructuring Costs	0	0	3	0
Assets
Total Assets	32,489		32,489		$ 33,112
Operating Segments [Member]
Revenue
Total Revenue	2,837	2,693	8,114	7,887
Adjusted PTC
Adjusted Pretax Contribution	327	238	870	670
Intersegment Eliminations [Member]
Revenue
Total Revenue	(9)	(13)	(34)	(22)
US and Utilities [Domain]
Revenue
Total Revenue	1,230		3,252
Assets
Total Assets	11,971		11,971		11,297
US and Utilities [Domain] | Operating Segments [Member]
Revenue
Total Revenue	1,230	1,086	3,252	3,179
Adjusted PTC
Adjusted Pretax Contribution	167	138	363	288
MCAC [Member]
Revenue
Total Revenue	462		1,276
Assets
Total Assets	4,477		4,477		4,087
MCAC [Member] | Operating Segments [Member]
Revenue
Total Revenue	462	397	1,276	1,120
Adjusted PTC
Adjusted Pretax Contribution	81	91	215	209
EURASIA [Member]
Revenue
Total Revenue	224		935
Assets
Total Assets	4,588		4,588		4,557
EURASIA [Member] | Operating Segments [Member]
Revenue
Total Revenue	224	380	935	1,204
Adjusted PTC
Adjusted Pretax Contribution	37	61	175	218
Corporate Other And Other Eliminations [Member]
Revenue
Total Revenue	(2)		(13)
Assets
Total Assets	293		293		263
Corporate Other And Other Eliminations [Member] | Operating Segments [Member]
Revenue
Total Revenue	7	9	21	29
Adjusted PTC
Adjusted Pretax Contribution	(86)	(119)	(264)	(334)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets
Total Assets	111		111		2,034
South America [Member]
Revenue
Total Revenue	923		2,664
Assets
Total Assets	11,049		11,049		$ 10,874
South America [Member] | Operating Segments [Member]
Revenue
Total Revenue	923	834	2,664	2,377
Adjusted PTC
Adjusted Pretax Contribution	$ 128	$ 67	$ 381	$ 289