Condensed Consolidated Statements of Changes in Equity and Comprehensive Income (Loss) (Unaudited) (Parenthetical) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Appalachian Power Co [Member]
Cash Flow Hedges, Tax	$ 652	$ 1,369
Amortization of Pension and OPEB Deferred Costs, Tax	837	1,124
Columbus Southern Power Co [Member]
Cash Flow Hedges, Tax	265	232
Amortization of Pension and OPEB Deferred Costs, Tax	688	667
Indiana Michigan Power Co [Member]
Cash Flow Hedges, Tax	570	39
Amortization of Pension and OPEB Deferred Costs, Tax	255	235
Ohio Power Co [Member]
Cash Flow Hedges, Tax	15	676
Amortization of Pension and OPEB Deferred Costs, Tax	2,156	1,897
Public Service Co Of Oklahoma [Member]
Cash Flow Hedges, Tax	407	39
Southwestern Electric Power Co [Member]
Cash Flow Hedges, Tax	137	48
Amortization of Pension and OPEB Deferred Costs, Tax	$ 681	$ 253

Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

+ References+ Details

Tax effect on adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 25
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 25
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details