Capacity of Facility Of Company Owned Solar Distribution Generation Facilities

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The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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Impairment Of Long Lived Assets To Be Disposed Of Net Of Tax

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Number of Solar Development Projects Acquired

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Oil and Gas Property, Number of Natural Gas Storage Fields

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Significant Acquisitions and Disposals, Expected Project Cost

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Significant Acquisitions and Disposals, Number of Natural Gas Producers that Rights in Acreage were Conveyed

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Significant Acquisitions and Disposals, Period for Payments Related to Conveyance of Natural Gas Storage Fields

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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-Name Accounting Standards Codification

-Topic 805

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The value of all consideration given or received by the Entity in the significant acquisition or disposal.

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Acquisitions and Dispositions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended		9 Months Ended	1 Months Ended			1 Months Ended		6 Months Ended	1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Marcellus Acreage Field acre	Dec. 31, 2013 Marcellus Acreage Natural_Gas_Producer acre	Sep. 30, 2014 Marcellus Acreage Field acre	Nov. 30, 2014 Marcellus Acreage Scenario, Forecast acre	Aug. 31, 2013 Elwood	Mar. 31, 2013 Elwood	Mar. 31, 2014 Electric Retail Energy Marketing Business	Jun. 30, 2013 Illinois Gas Contracts	Jun. 30, 2013 Brayton Point and Kincaid	Mar. 31, 2014 Acquisition of Solar Development Projects Project MW	May 31, 2014 Strata Solar Development LLC Project MW	Sep. 30, 2014 EDF Renewable Development Inc Project MW	May 31, 2014 EDF Renewable Development Inc MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired												100.00%	100.00%	100.00%	100.00%
Number of solar development projects												6	2	2
Acquisition price of solar development projects												$ 50	$ 2	$ 175	$ 70
Expected cost of projects												450	70	185	75
Expected generation capacity of facilities												139	32	42	20
Proceeds from the sale of electric retail energy marketing business	187	0							187
Gain on sale									100	29
After tax gain on sale									57	18
Write off of goodwill									31	3
Sales price subject to post-closing adjustments										32
Proceeds from sale of Brayton Point, Kincaid and equity method investment in Elwood							465
Impairment of long-lived assets to be disposed of											48
Impairment charge, net of tax											28
Ownership%								50.00%
Number of natural gas producers				2
Number of acres of development rights			24,000	100,000	24,000	12,000
Payments provided by agreement subject to customary adjustments			120	200	120
Period for payments to DTI			4 years	9 years	9 years
Cash proceeds from sale of assets					16	60
Deferred revenue			$ 88		$ 88
Number of natural gas storage fields			1		1