Income Taxes (Details) $ in Millions	6 Months Ended
Jun. 30, 2016 USD ($)
Income Taxes (Textuals) [Abstract]
Unrealized Capital Loss Valuation Allowance Reversal	$ 56
Unrecognized Tax Benefit Related To Valuation Allowance	62
Valuation Allowance	75
Transmission and Distribution Expenses Net Income Adjustment	21
Public Service Co Of Oklahoma [Member]
Income Taxes (Textuals) [Abstract]
Transmission and Distribution Expenses Net Income Adjustment	2
Southwestern Electric Power Co [Member]
Income Taxes (Textuals) [Abstract]
Transmission and Distribution Expenses Net Income Adjustment	$ 9

Income Taxes.

No definition available.

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- Definition

Adjustment to net income for transmission and distribution expenses included in computation of cost of goods sold deduction. This is a result of clarifying guidance regarding the treatment of transmission and distribution expenses included in the computation of taxable income for purposes of calculating the Texas gross margins tax issued by the Texas Comptroller of Public Accounts.

+ References

No definition available.

+ Details

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- Definition

Reversal in the valuation allowance related to the settlement of a 2011 audit issue with the IRS.

+ References

No definition available.

+ Details

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- Definition

Decrease in AEP's unrecognized tax benefit associated with the settlement of a 2011 audit issue with the IRS.

+ References

No definition available.

+ Details

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

+ Details

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- Details

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- Details

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