2.4.0.8000525 - Disclosure - Benefit Plans (Tables)truefalsefalse1false falsefalseFROM_Jan01_2013_TO_Jun30_2013http://www.sec.gov/CIK0000004904duration2013-01-01T00:00:002013-06-30T00:00:001false 4us-gaap_ScheduleOfNetBenefitCostsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in millions)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 18</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 19</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 11</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 51</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 55</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 17</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 26</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (70)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (79)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (26)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (25)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Credit</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (18)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (4)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 46</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 38</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 16</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 15</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 45</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 33</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (5)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 23</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in millions)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 35</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 38</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 12</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 23</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 101</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 111</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 35</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 52</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (139)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (159)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (53)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (50)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (35)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (9)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 92</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 75</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 32</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 29</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 90</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 65</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (9)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 45</td></tr></table></div>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 false0Components of Net Periodic Benefit Cost2false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false truefalseFROM_Jan01_2013_TO_Jun30_2013_dei_LegalEntityAxis_AppalachianPowerCoMemberhttp://www.sec.gov/CIK0000004904duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseAppalachian Power Co [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiaep_AppalachianPowerCoMemberdei_LegalEntityAxisexplicitMembernanafalse0Appalachian Power Co [Member]3false 4us-gaap_ScheduleOfNetBenefitCostsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 14px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">APCo</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,542</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,891</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 642</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,347</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,915</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 7,553</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,364</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 4,615</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (9,260)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (10,486)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (4,537)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (4,188)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Transition Obligation</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 200</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 50</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 119</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (2,513)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (715)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 6,257</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 5,084</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 3,062</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 2,632</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 5,504</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 4,161</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 18</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 3,891</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,085</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,782</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,283</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,694</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 13,831</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 15,106</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,727</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 9,231</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (18,520)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (20,972)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (9,073)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (8,376)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Transition Obligation</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 400</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 99</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 238</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (5,025)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,431)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 12,513</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 10,169</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 6,124</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 5,263</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 11,008</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 8,323</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 36</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 7,781</td></tr></table></div>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 false0Components of Net Periodic Benefit Cost4false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false truefalseFROM_Jan01_2013_TO_Jun30_2013_dei_LegalEntityAxis_IndianaMichiganPowerCoMemberhttp://www.sec.gov/CIK0000004904duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseIndiana Michigan Power Co [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiaep_IndianaMichiganPowerCoMemberdei_LegalEntityAxisexplicitMembernanafalse0Indiana Michigan Power Co [Member]5false 4us-gaap_ScheduleOfNetBenefitCostsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 14px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">I&M</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,184</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,477</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 805</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,655</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,025</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,561</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,055</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,197</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (8,206)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (9,392)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (3,296)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (3,212)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Transition Obligation</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 33</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 48</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 102</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (2,355)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (596)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 5,422</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 4,393</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 1,881</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 1,763</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 5,473</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 4,141</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (910)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 2,840</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 4,368</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 4,954</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,610</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,310</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 12,050</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 13,122</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 4,110</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,393</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (16,413)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (18,783)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (6,592)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (6,423)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Transition Obligation</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 66</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 97</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 204</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (4,710)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,192)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 10,844</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 8,785</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 3,763</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 3,525</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 10,946</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 8,282</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (1,819)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 5,679</td></tr></table></div>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 false0Components of Net Periodic Benefit Cost6false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse4false truefalseFROM_Jan01_2013_TO_Jun30_2013_dei_LegalEntityAxis_OhioPowerCoMemberhttp://www.sec.gov/CIK0000004904duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseOhio Power Co [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiaep_OhioPowerCoMemberdei_LegalEntityAxisexplicitMembernanafalse0Ohio Power Co [Member]7false 4us-gaap_ScheduleOfNetBenefitCostsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 14px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">OPCo</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,373</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,751</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,299</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,187</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 10,292</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 11,299</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 4,447</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,048</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (15,142)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (17,101)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (6,239)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (5,639)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Transition Obligation</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 26</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 70</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 185</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (3,230)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (968)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 9,309</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 7,610</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 4,041</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 3,417</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 6,902</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 4,744</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 318</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 5,071</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 4,745</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 5,502</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,599</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 4,374</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 20,584</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 22,597</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 8,894</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 12,095</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (30,283)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (34,201)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (12,477)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (11,278)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Transition Obligation</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> -</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 52</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 141</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 371</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (6,461)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,936)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 18,618</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 15,220</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 8,082</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 6,834</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 13,805</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 9,489</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 637</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 10,141</td></tr></table></div>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 false0Components of Net Periodic Benefit Cost8false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse5false truefalseFROM_Jan01_2013_TO_Jun30_2013_dei_LegalEntityAxis_PublicServiceCoOfOklahomaMemberhttp://www.sec.gov/CIK0000004904duration2013-01-01T00:00:002013-06-30T00:00:00falsefalsePublic Service Co Of Oklahoma [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiaep_PublicServiceCoOfOklahomaMemberdei_LegalEntityAxisexplicitMembernanafalse0Public Service Co Of Oklahoma [Member]9false 4us-gaap_ScheduleOfNetBenefitCostsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 14px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">PSO</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,390</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,488</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 343</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 709</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,749</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,075</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 948</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,450</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (3,919)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (4,504)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,522)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,481)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 74</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (237)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,073)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (269)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 2,461</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 2,051</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 869</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 797</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 2,755</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 1,873</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (435)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 1,206</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,781</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,976</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 686</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,418</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 5,497</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,150</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,896</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,899</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (7,837)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (9,008)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (3,044)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (2,961)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 148</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (474)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (2,145)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (539)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 4,922</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 4,103</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 1,738</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 1,594</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 5,511</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 3,747</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (869)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 2,411</td></tr></table></div>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 false0Components of Net Periodic Benefit Cost10false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse6false truefalseFROM_Jan01_2013_TO_Jun30_2013_dei_LegalEntityAxis_SouthwesternElectricPowerCoMemberhttp://www.sec.gov/CIK0000004904duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSouthwestern Electric Power Co [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiaep_SouthwesternElectricPowerCoMemberdei_LegalEntityAxisexplicitMembernanafalse0Southwestern Electric Power Co [Member]11false 4us-gaap_ScheduleOfNetBenefitCostsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 14px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">SWEPCo</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Three Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,753</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,774</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 423</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 831</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,863</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,135</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,076</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,668</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (4,128)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (4,716)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,720)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,698)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 88</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (199)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (1,290)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (233)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 2,554</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 2,082</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 982</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 914</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 3,130</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 2,076</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (529)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 1,482</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;"> </td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; text-align:center;border-color:#000000;min-width:213px;">Other Postretirement</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Pension Plans</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:213px;">Benefit Plans</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="5" style="width: 213px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:213px;">Six Months Ended June 30,</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2013</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td colspan="2" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;">2012</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;"> </td><td colspan="11" style="width: 441px; text-align:center;border-color:#000000;min-width:441px;">(in thousands)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Service Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,506</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,549</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 846</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 1,662</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Interest Cost</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 5,727</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 6,269</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 2,151</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 3,336</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Expected Return on Plan Assets</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (8,255)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (9,433)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (3,440)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (3,397)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Prior Service Cost (Credit)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> 175</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (397)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (2,578)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"> (466)</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Amortization of Net Actuarial Loss</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 5,107</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 4,165</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 1,964</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"> 1,829</td></tr><tr style="height: 15px"><td style="width: 245px; text-align:left;border-color:#000000;min-width:245px;">Net Periodic Benefit Cost (Credit)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 6,260</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 4,153</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> (1,057)</td><td style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"> 2,964</td></tr></table></div>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 false0Components of Net Periodic Benefit CostfalseBenefit Plans (Tables)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.aep.com/role/BenefitPlansTables111