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Segments (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	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		$ 384	$ 418	$ 719	$ 536
Assets
Total Assets		38,584		38,584		$ 38,966
External [Member]
Revenue
Total Revenue		3,858	4,311	7,842	8,573
Adjusted PTC
Adjusted Pretax Contribution	[1]	251	340	503	583
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative gains (losses)		2	22	17	32
Unrealized foreign currency gains (losses)		3	(7)	(44)	(33)
Disposition/acquisition gains		4	(2)	9	(1)
Impairment losses		(30)	(99)	(36)	(265)
Loss on extinguishment of debt		(115)	(13)	(142)	(147)
Pretax contribution		115	241	307	169
Add: income from continuing operations before taxes, attributable to noncontrolling interests		269	197	427	412
Less: Net equity in earnings of affiliates		0	20	15	45
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES		384	418	719	536
Operating Segments [Member]
Revenue
Total Revenue		3,869	4,315	7,859	8,580
Adjusted PTC
Adjusted Pretax Contribution	[1]	251	340	503	583
Intersegment Eliminations [Member]
Revenue
Total Revenue		(11)	(4)	(17)	(7)
Adjusted PTC
Adjusted Pretax Contribution	[1]	0	0	0	0
UNITED STATES
Assets
Total Assets		10,089		10,089		10,062
UNITED STATES | External [Member]
Revenue
Total Revenue		831	893	1,828	1,894
Adjusted PTC
Adjusted Pretax Contribution	[1]	59	83	168	161
UNITED STATES | Operating Segments [Member]
Revenue
Total Revenue		831	893	1,828	1,894
Adjusted PTC
Adjusted Pretax Contribution	[1]	56	80	162	155
UNITED STATES | Intersegment Eliminations [Member]
Revenue
Total Revenue		0	0	0	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	3	3	6	6
Andes - Generation [Member]
Assets
Total Assets		8,349		8,349		7,888
Andes - Generation [Member] | External [Member]
Revenue
Total Revenue		628	723	1,238	1,343
Adjusted PTC
Adjusted Pretax Contribution	[1]	86	105	180	161
Andes - Generation [Member] | Operating Segments [Member]
Revenue
Total Revenue		630	724	1,242	1,344
Adjusted PTC
Adjusted Pretax Contribution	[1]	81	104	172	157
Andes - Generation [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		(2)	(1)	(4)	(1)
Adjusted PTC
Adjusted Pretax Contribution	[1]	5	1	8	4
BRAZIL
Assets
Total Assets		7,790		7,790		8,439
BRAZIL | External [Member]
Revenue
Total Revenue		1,315	1,533	2,645	2,978
Adjusted PTC
Adjusted Pretax Contribution	[1]	41	115	63	185
BRAZIL | Operating Segments [Member]
Revenue
Total Revenue		1,315	1,533	2,645	2,978
Adjusted PTC
Adjusted Pretax Contribution	[1]	41	115	62	184
BRAZIL | Intersegment Eliminations [Member]
Revenue
Total Revenue		0	0	0	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	0	0	1	1
MCAC - Generation [Member]
Assets
Total Assets		5,031		5,031		4,948
MCAC - Generation [Member] | External [Member]
Revenue
Total Revenue		600	692	1,197	1,329
Adjusted PTC
Adjusted Pretax Contribution	[1]	111	105	165	174
MCAC - Generation [Member] | Operating Segments [Member]
Revenue
Total Revenue		601	692	1,199	1,330
Adjusted PTC
Adjusted Pretax Contribution	[1]	106	95	156	160
MCAC - Generation [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		(1)	0	(2)	(1)
Adjusted PTC
Adjusted Pretax Contribution	[1]	5	10	9	14
Europe [Member]
Assets
Total Assets		3,497		3,497		3,525
Europe [Member] | External [Member]
Revenue
Total Revenue		296	305	626	696
Adjusted PTC
Adjusted Pretax Contribution	[1]	40	76	128	194
Europe [Member] | Operating Segments [Member]
Revenue
Total Revenue		299	305	629	696
Adjusted PTC
Adjusted Pretax Contribution	[1]	41	73	126	188
Europe [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		(3)	0	(3)	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	(1)	3	2	6
Asia [Member]
Assets
Total Assets		3,127		3,127		2,972
Asia [Member] | External [Member]
Revenue
Total Revenue		187	163	306	331
Adjusted PTC
Adjusted Pretax Contribution	[1]	31	23	43	32
Asia [Member] | Operating Segments [Member]
Revenue
Total Revenue		187	163	306	331
Adjusted PTC
Adjusted Pretax Contribution	[1]	30	23	42	31
Asia [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		0	0	0	0
Adjusted PTC
Adjusted Pretax Contribution	[1]	1	0	1	1
Corporate Other And Other Eliminations [Member]
Assets
Total Assets		543		543		1,132
Corporate Other And Other Eliminations [Member] | External [Member]
Revenue
Total Revenue		1	2	2	2
Adjusted PTC
Adjusted Pretax Contribution	[1]	(117)	(167)	(244)	(324)
Corporate Other And Other Eliminations [Member] | Operating Segments [Member]
Revenue
Total Revenue		6	5	10	7
Adjusted PTC
Adjusted Pretax Contribution	[1]	(104)	(150)	(217)	(292)
Corporate Other And Other Eliminations [Member] | Intersegment Eliminations [Member]
Revenue
Total Revenue		(5)	(3)	(8)	(5)
Adjusted PTC
Adjusted Pretax Contribution	[1]	(13)	$ (17)	(27)	$ (32)
Discontinued Operations [Member]
Assets
Total Assets		$ 158		$ 158		$ 0
[1] Adjusted PTC in each segment before intersegment eliminations includes the effect of intercompany transactions with other segments except for interest, charges for certain management fees and the write-off of intercompany balances.

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