No authoritative reference available.

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Percentage of voting equity interests acquired in the business combination.

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The pro forma net income (loss) for the period as if the business combination or combinations had been completed at the beginning of a period

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RECENT INVESTMENT ACTIVITY (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2011 Luz Del Sur [Member]	Mar. 31, 2011 Chilquinta Energia [Member]	Mar. 31, 2012 South America Acquisition [Member]	Sep. 13, 2011 Luz Del Sur [Member]	Apr. 06, 2011 Luz Del Sur [Member]	Apr. 06, 2011 Chilquinta Energia [Member]
Business Acquisition Line Items
Ownership Percentage Before Acquisition						38.00%	50.00%
Acquired percentage interest in joint venture							100.00%
Ownership percentage after Luz Del Sur tender offer					80.00%
Revenue of acquiree since acquisition date				$ 357
Net Income of acquiree since acquisition date				49
Earnings of acquiree since acquisition date				43
Pro forma revenues	2,777
Pro forma earnings	279
Equity Earnings Line Items
Equity Earnings Of Unconsolidated Subsidiary		$ 12	$ 12