The amount of distributions received from 50%-or-less owned affiliates

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Gross gain recognized on consummation of share purchase and settlement agreement.

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Total generation capacity of the subsidiary, in megawatts.

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The incremental increase in the potential effective percentage of the affiliate's voting interest the reporting entity may own in the future under existing purchase agreements.

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The initial amount of the Company's investment in an affiliate

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The effective percentage of the affiliate's voting interest owned by the reporting entity (directly or indirectly)

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The total potential effective percentage of the affiliate's voting interest the reporting entity may own in the future under existing purchase agreements.

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- Definition

The amount of the investment in the joint venture by the Company in the current period

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The amount of long-term liabilities associated with a debt agreement under which no material financial of operating decisions can be made with the banks' consent, resulting in loss of control of the affiliate by the parent

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Amount of the net liability reversed under settlement of share purchase and sale agreement.

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Expense recognized as income tax expense on consummation of share purchase and settlement agreement.

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The ownership percentage in an affiliate held by a third party investor

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Amount of payment received from counterparty under settlement of share purchase and sale agreement.

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Amount of loan to third party released under settlement of share purchase and sale agreement.

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The total cumulative investment in the joint venture by the Company

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The total potential investment in the joint venture by the Company and other partners in the joint venture

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The amount of undistributed earnings of 50%-or-less owned affiliates included in retained earnings

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Voting interest in a subsidiary of an equity method affiliate transferred to counterparty under settlement of share purchase and sale agreement.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 9
-Article 5

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 18
-Article 5

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 19
-Subparagraph h

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable form a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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- Definition

Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 21
-Article 5

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Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22, 23, 24, 25, 26, 27
-Article 5

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Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 27
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 7

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 26

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A3
-Appendix A

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A1, A4, A5

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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Article 5

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Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A3
-Appendix A

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
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Investments In and Advances To Affiliates (Details) (USD $)	3 Months Ended								12 Months Ended									12 Months Ended					12 Months Ended																	12 Months Ended						12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2010 Solar Energy Affiliate [Member]	Dec. 31, 2009 Solar Energy Affiliate [Member]	Dec. 31, 2010 Solar Power Affiliate [Member]	Dec. 31, 2009 Solar Power Affiliate [Member]	Dec. 31, 2010 Barry Affiliate [Member]	Dec. 31, 2009 Barry Affiliate [Member]	Dec. 31, 2010 CEMIG [Member]	Dec. 31, 2002 CEMIG [Member]	Dec. 31, 2009 CEMIG [Member]	Dec. 31, 2010 Chigen Affiliate [Member]	Dec. 31, 2009 Chigen Affiliate [Member]	Dec. 31, 2010 China Wind Affiliate [Member]	Dec. 31, 2009 China Wind Affiliate [Member]	Dec. 31, 2010 Elsta Affiliate [Member]	Dec. 31, 2009 Elsta Affiliate [Member]	Dec. 31, 2010 Guacolda Affiliate [Member]	Dec. 31, 2009 Guacolda Affiliate [Member]	Dec. 31, 2010 Ictas Energy Group Affiliate [Member]	Dec. 31, 2009 Ictas Energy Group Affiliate [Member]	Dec. 31, 2010 Innovent Affiliate [Member]	Dec. 31, 2009 Innovent Affiliate [Member]	Dec. 31, 2010 JHRH Affiliate [Member]	Dec. 31, 2009 JHRH Affiliate [Member]	Dec. 31, 2010 OPGC Affiliate [Member]	Dec. 31, 2009 OPGC Affiliate [Member]	Dec. 31, 2010 Trinidad Generation Unlimited Affiliate [Member] mw	Dec. 31, 2009 Trinidad Generation Unlimited Affiliate [Member]	Dec. 31, 2008 Trinidad Generation Unlimited Affiliate [Member]	Dec. 31, 2010 SEB [Member]	Dec. 31, 2009 SEB [Member]	Dec. 31, 2010 Other Affiliates [Member]	Dec. 31, 2009 Other Affiliates [Member]	Dec. 31, 2010 Cartagena Affiliate [Member] mw	Dec. 31, 2009 Cartagena Affiliate [Member]	Dec. 31, 2010 Minority Owned Affiliates [Member]	Dec. 31, 2009 Minority Owned Affiliates [Member]	Dec. 31, 2008 Minority Owned Affiliates [Member]	Dec. 31, 2010 Majority Owned Affiliates [Member]	Dec. 31, 2009 Majority Owned Affiliates [Member]	Dec. 31, 2008 Majority Owned Affiliates [Member]
Investments In And Advances To Affiliates General Disclosure Abstract
Investments in and advances to affiliates	$ 1,320,000,000				$ 1,157,000,000				$ 1,320,000,000	$ 1,157,000,000	$ 901,000,000	$ 256,000,000	$ 224,000,000	$ 8,000,000	$ 0	$ 0	$ 0	$ 22,000,000		$ 0	$ 146,000,000	$ 182,000,000	$ 69,000,000	$ 52,000,000	$ 202,000,000	$ 204,000,000	$ 149,000,000	$ 131,000,000	$ 151,000,000	$ 104,000,000	$ 31,000,000	$ 30,000,000	$ 39,000,000	$ 0	$ 224,000,000	$ 208,000,000	$ 20,000,000	$ 16,000,000				$ 3,000,000	$ 6,000,000		$ 0
Effective Ownership %												50.00%	50.00%	50.00%	0.00%	100.00%	100.00%	72.00%		10.00%	25.00%	27.00%	49.00%	49.00%	50.00%	50.00%	35.00%	35.00%	51.00%	51.00%	40.00%	40.00%	35.00%	0.00%	49.00%	49.00%	10.00%	10.00%	60.00%			0.00%	0.00%	71.00%	71.00%
Generation Capacity (MW)																																					720							1,199
Investment In Affiliate Initial Investment																																												29,000,000
Total Cumulative Investment In Joint Venture												312,000,000		11,000,000									62,000,000
Long Term Liabilities Associated With Debt Agreement Resulting In Loss Of Control																53,000,000	54,000,000
Voting Interest In Affiliate Transferred Percent																		14.80%
Release Of Affiliate Loan Amount																																								1,400,000,000
Payment Received From Counterparty Settlement Amount																																								25,000,000
Equity Method Investment Other Than Temporary Impairment																			155,000,000
Valuation Allowance Deferred Tax Asset Change In Amount									336,000,000	261,000,000									587,000,000
Net Liability Reversed Under Settlement Agreement Amount																																									484,000,000
Gain Recognized On Consummation Of Share Purchase Agreement																																								115,000,000
Net Tax Expense Not Recorded As Equity Earnings Amount																																								70,000,000
Total Potential Investment In Joint Venture												500,000,000		100,000,000
Investment In Joint Venture																							12,000,000
Ownership Percentage Held By Third Party Investor																																							40.00%
Investment In Affiliate Total Potential Ownership Percentage																																	49.00%
Investment In Affiliate Incremental Potential Ownership Percentage																																	14.00%
Investments In And Advances To Affiliates Financial Information Disclosure Abstract
Revenues																																														1,341,000,000	1,229,000,000	1,180,000,000	20,000,000	158,000,000	170,000,000
Gross margin	1,043,000,000	982,000,000	1,002,000,000	961,000,000	822,000,000	961,000,000	790,000,000	833,000,000	3,988,000,000	3,406,000,000	3,417,000,000																																			207,000,000	240,000,000	274,000,000	18,000,000	71,000,000	61,000,000
Net income (loss)	(169,000,000)	397,000,000	429,000,000	402,000,000	283,000,000	440,000,000	530,000,000	502,000,000	1,059,000,000	1,755,000,000	2,032,000,000																																			100,000,000	110,000,000	83,000,000	7,000,000	(5,000,000)	(4,000,000)
Current assets	9,446,000,000				8,787,000,000				9,446,000,000	8,787,000,000																																				948,000,000	882,000,000		114,000,000	142,000,000
Noncurrent assets																																														4,131,000,000	3,543,000,000		646,000,000	1,140,000,000
Current liabilities	8,065,000,000				6,621,000,000				8,065,000,000	6,621,000,000																																				687,000,000	528,000,000		144,000,000	153,000,000
Noncurrent Liabilities	21,973,000,000				23,974,000,000				21,973,000,000	23,974,000,000																																				1,597,000,000	1,406,000,000		242,000,000	1,055,000,000
Noncontrolling interests	3,940,000,000				4,205,000,000				3,940,000,000	4,205,000,000																																				(206,000,000)	(191,000,000)		125,000,000	(24,000,000)
Stockholder's equity	6,473,000,000				4,675,000,000				6,473,000,000	4,675,000,000																																				3,001,000,000	2,682,000,000		249,000,000	98,000,000
Undistributed Earnings Of Minority Owned Affiliates Included In Retained Earnings	168,000,000								168,000,000
Distributions Received From Minority Owned Affiliates									$ 49,000,000	$ 35,000,000	$ 50,000,000