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Variable Interest Entities and Unconsolidated Investments in Power Plants (Income from Unconsolidated Investements 10-Q) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
(Income) from unconsolidated investments in power plants	$ (5)	$ (9)
Greenfield [Member]
(Income) from unconsolidated investments in power plants	(2)	(5)
Whitby [Member]
(Income) from unconsolidated investments in power plants	$ (3)	$ (4)

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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