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Variable Interest Entities and Unconsolidated Investments (Unconsolidated Investements) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Loss from Unconsolidated Investments in Power Plants and Distributions [Line Items]
(Income) from unconsolidated investments in power plants	$ (30)	$ (28)	$ (21)
Return on investment in unconsolidated subsidiaries	27	29	6
Greenfield [Member]
Income Loss from Unconsolidated Investments in Power Plants and Distributions [Line Items]
(Income) from unconsolidated investments in power plants	(16)	(17)	(12)
Return on investment in unconsolidated subsidiaries	18	22	2
Whitby [Member]
Income Loss from Unconsolidated Investments in Power Plants and Distributions [Line Items]
(Income) from unconsolidated investments in power plants	(14)	(11)	(9)
Return on investment in unconsolidated subsidiaries	$ 9	$ 7	$ 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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