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Investments in Unconsolidated Affiliates (Investments in Equity Method Unconsolidated Affiliates) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments In Unconsolidated Affiliates [Line Items]
Investments in unconsolidated affiliates	$ 390	$ 483
Equity in earnings (losses) of unconsolidated affiliates	122	148	160
Regulated Utilities [Member]
Investments In Unconsolidated Affiliates [Line Items]
Investments in unconsolidated affiliates	4	5
Equity in earnings (losses) of unconsolidated affiliates	(1)	(5)	0
International Energy [Member]
Investments In Unconsolidated Affiliates [Line Items]
Investments in unconsolidated affiliates	82	81
Equity in earnings (losses) of unconsolidated affiliates	110	134	145
Commercial Power [Member]
Investments In Unconsolidated Affiliates [Line Items]
Investments in unconsolidated affiliates	252	219
Equity in earnings (losses) of unconsolidated affiliates	7	14	6
Other [Member]
Investments In Unconsolidated Affiliates [Line Items]
Investments in unconsolidated affiliates	52	178
Equity in earnings (losses) of unconsolidated affiliates	$ 6	$ 5	$ 9

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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