Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Uk Windfall Tax Issue [Member]	Dec. 31, 2012 Uk Windfall Tax Issue [Member]	Jun. 30, 2013 Appalachian Power Co [Member]	Jun. 30, 2012 Appalachian Power Co [Member]	Jun. 30, 2013 Appalachian Power Co [Member]	Jun. 30, 2012 Appalachian Power Co [Member]	Jun. 30, 2013 Indiana Michigan Power Co [Member]	Jun. 30, 2012 Indiana Michigan Power Co [Member]	Jun. 30, 2013 Indiana Michigan Power Co [Member]	Jun. 30, 2012 Indiana Michigan Power Co [Member]	Jun. 30, 2013 Ohio Power Co [Member]	Jun. 30, 2012 Ohio Power Co [Member]	Jun. 30, 2013 Ohio Power Co [Member]	Jun. 30, 2012 Ohio Power Co [Member]	Jun. 30, 2013 Public Service Co Of Oklahoma [Member]	Jun. 30, 2012 Public Service Co Of Oklahoma [Member]	Jun. 30, 2013 Public Service Co Of Oklahoma [Member]	Jun. 30, 2012 Public Service Co Of Oklahoma [Member]	Jun. 30, 2013 Southwestern Electric Power Co [Member]	Jun. 30, 2012 Southwestern Electric Power Co [Member]	Jun. 30, 2013 Southwestern Electric Power Co [Member]	Jun. 30, 2012 Southwestern Electric Power Co [Member]
Income Taxes (Textuals) [Abstract]
Income Tax Benefit	$ (68,000,000)	$ (190,000,000)	$ (263,000,000)	$ (379,000,000)	$ 80,000,000		$ (19,897,000)	$ (34,979,000)	$ (66,909,000)	$ (86,192,000)	$ (19,886,000)	$ (12,468,000)	$ (41,149,000)	$ (28,781,000)	$ (11,376,000)	$ (61,205,000)	$ (81,172,000)	$ (130,712,000)	$ (17,927,000)	$ (21,416,000)	$ (26,561,000)	$ (29,517,000)	$ (15,326,000)	$ (11,505,000)	$ (22,122,000)	$ (23,977,000)
Interest and Investment Income	49,000,000	2,000,000	52,000,000	4,000,000	43,000,000
Net Income (Loss)	339,000,000	363,000,000	703,000,000	753,000,000	108,000,000		29,862,000	62,332,000	100,410,000	137,643,000	40,754,000	29,810,000	84,211,000	69,031,000	21,056,000	101,423,000	150,830,000	252,253,000	28,432,000	35,211,000	42,125,000	47,859,000	30,227,000	54,902,000	41,775,000	91,297,000
Unrecognized Tax Benefits						$ 64,000,000

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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