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Asset impairment on related material and supplies inventory.

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No definition available.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Acquisitions, Dispositions and Impairments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Acquisitions of Assets			$ 45,000,000	$ 6,000,000
Goodwill	91,000,000		91,000,000		91,000,000
Asset Impairments and Other Related Charges	0	144,000,000	0	298,000,000
Generation And Marketing [Member] \| Muskingum River Plant Unit 5 [Member]
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Asset Impairments and Other Related Charges				154,000,000
Asset Impairment on Related Material and Supplies Inventory		6,000,000		6,000,000
Fair Value of MR5 Generating Unit		0		0
Vertically Integrated Utilities [Member] \| Turk Plant [Member]
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Asset Impairments and Other Related Charges				111,000,000
Vertically Integrated Utilities [Member] \| Big Sandy Plant Unit 2 FGD Project [Member]
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Asset Impairments and Other Related Charges				33,000,000
Southwestern Electric Power Co [Member]
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Asset Impairments and Other Related Charges	0	110,850,000	0	110,850,000
Southwestern Electric Power Co [Member] \| Turk Plant [Member]
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Asset Impairments and Other Related Charges				111,000,000
Ohio Power Co [Member]
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Asset Impairments and Other Related Charges	0	0	0	154,304,000
Ohio Power Co [Member] \| Muskingum River Plant Unit 5 [Member]
Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract]
Asset Impairments and Other Related Charges				154,000,000
Asset Impairment on Related Material and Supplies Inventory		6,000,000		6,000,000
Fair Value of MR5 Generating Unit		$ 0		$ 0