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Asset Impairments (Narrative) (Details) (USD $)	2 Months Ended	3 Months Ended
Asset Impairments (Narrative) (Details) (USD $)	Feb. 29, 2012	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Percentage decrease in market price	14.00%
Noncash impairment charge		$ 628,000,000
Property, plant and equipment, net		17,535,000,000		18,127,000,000
Merchant Generation [Member]
Property, plant and equipment, net		2,600,000,000
Long-Lived asset carrying value in excess of estimated fair value		$ 1,000,000,000

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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