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Segments (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of strategic business units | segment				6
Number of reportable segments | segment				6
Reconciliation To Income From Continuing Operations Before Taxes
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES		$ 166	$ 606	$ 885	$ 1,142
Assets
Total Assets		37,000		37,000		$ 38,966
External [Member]
Revenue
Total Revenue		3,721	4,441	11,563	13,014
Adjusted PTC
Adjusted Pretax Contribution	[1]	322	354	825	937
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative gains (losses)		12	(11)	29	21
Unrealized foreign currency gains (losses)		(6)	(62)	(50)	(95)
Disposition/acquisition gains		23	367	32	366
Impairment losses		(139)	(30)	(175)	(295)
Loss on extinguishment of debt		(21)	(66)	(163)	(213)
Pretax contribution		191	552	498	721
Add: income from continuing operations before taxes, attributable to noncontrolling interests		57	48	484	460
Less: Net equity in earnings of affiliates		82	(6)	97	39
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES		166	606	885	1,142
Operating Segments [Member]
Revenue
Total Revenue		3,731	4,447	11,590	13,027
Adjusted PTC
Adjusted Pretax Contribution	[1]	322	354	825	937
Intersegment Eliminations [Member]
Revenue
Total Revenue		(10)	(6)	(27)	(13)
Adjusted PTC
Adjusted Pretax Contribution	[1]	0	0	0	0
UNITED STATES
Assets
Total Assets		10,071		10,071		10,062
UNITED STATES | External [Member]
Revenue
Total Revenue		923	1,002	2,751	2,896
Adjusted PTC
Adjusted Pretax Contribution	[1]	104	159	272	320
UNITED STATES | Operating Segments [Member]
Revenue
Total Revenue		923	1,002	2,751	2,896
Adjusted PTC
Adjusted Pretax Contribution	[1]	101	156	263	311
UNITED STATES | Intersegment Eliminations [Member]
Revenue
Total Revenue		0	0	0	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	3	3	9	9
Andes - Generation [Member]
Assets
Total Assets		8,580		8,580		7,888
Andes - Generation [Member] | External [Member]
Revenue
Total Revenue		650	703	1,888	2,046
Adjusted PTC
Adjusted Pretax Contribution	[1]	154	119	334	280
Andes - Generation [Member] | Operating Segments [Member]
Revenue
Total Revenue		652	704	1,894	2,048
Adjusted PTC
Adjusted Pretax Contribution	[1]	150	120	322	277
Andes - Generation [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		(2)	(1)	(6)	(2)
Adjusted PTC
Adjusted Pretax Contribution	[1]	4	(1)	12	3
BRAZIL
Assets
Total Assets		6,289		6,289		8,439
BRAZIL | External [Member]
Revenue
Total Revenue		1,065	1,548	3,710	4,526
Adjusted PTC
Adjusted Pretax Contribution	[1]	24	1	87	186
BRAZIL | Operating Segments [Member]
Revenue
Total Revenue		1,065	1,548	3,710	4,526
Adjusted PTC
Adjusted Pretax Contribution	[1]	23	0	85	184
BRAZIL | Intersegment Eliminations [Member]
Revenue
Total Revenue		0	0	0	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	1	1	2	2
MCAC - Generation [Member]
Assets
Total Assets		5,064		5,064		4,948
MCAC - Generation [Member] | External [Member]
Revenue
Total Revenue		597	692	1,794	2,021
Adjusted PTC
Adjusted Pretax Contribution	[1]	97	128	262	302
MCAC - Generation [Member] | Operating Segments [Member]
Revenue
Total Revenue		597	693	1,796	2,023
Adjusted PTC
Adjusted Pretax Contribution	[1]	92	124	248	284
MCAC - Generation [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		0	(1)	(2)	(2)
Adjusted PTC
Adjusted Pretax Contribution	[1]	5	4	14	18
Europe [Member]
Assets
Total Assets		3,291		3,291		3,525
Europe [Member] | External [Member]
Revenue
Total Revenue		290	371	916	1,067
Adjusted PTC
Adjusted Pretax Contribution	[1]	45	82	173	276
Europe [Member] | Operating Segments [Member]
Revenue
Total Revenue		292	371	921	1,067
Adjusted PTC
Adjusted Pretax Contribution	[1]	45	79	171	267
Europe [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		(2)	0	(5)	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	0	3	2	9
Asia [Member]
Assets
Total Assets		3,206		3,206		2,972
Asia [Member] | External [Member]
Revenue
Total Revenue		195	125	501	456
Adjusted PTC
Adjusted Pretax Contribution	[1]	25	2	68	34
Asia [Member] | Operating Segments [Member]
Revenue
Total Revenue		195	125	501	456
Adjusted PTC
Adjusted Pretax Contribution	[1]	24	2	66	33
Asia [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		0	0	0	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	1	0	2	1
Corporate Other And Other Eliminations [Member]
Assets
Total Assets		447		447		1,132
Corporate Other And Other Eliminations [Member] | External [Member]
Revenue
Total Revenue		1	0	3	2
Adjusted PTC
Adjusted Pretax Contribution	[1]	(127)	(137)	(371)	(461)
Corporate Other And Other Eliminations [Member] | Operating Segments [Member]
Revenue
Total Revenue		7	4	17	11
Adjusted PTC
Adjusted Pretax Contribution	[1]	(113)	(127)	(330)	(419)
Corporate Other And Other Eliminations [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		(6)	(4)	(14)	(9)
Adjusted PTC
Adjusted Pretax Contribution	[1]	(14)	$ (10)	(41)	$ (42)
Discontinued Operations [Member]
Assets
Total Assets		$ 52		$ 52		$ 0
[1] Total Assets September 30, 2015 December 31, 2014US SBU $10,071 $10,062Andes SBU 8,580 7,888Brazil SBU 6,289 8,439MCAC SBU 5,064 4,948Europe SBU 3,291 3,525Asia SBU 3,206 2,972Assets of held-for-sale businesses 52 —Corporate and Other & eliminations 447 1,132Total Assets $37,000 $38,966

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