2.2.0.25falsefalse0502 - Disclosure - Retirement Benefits (Tables)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($)
USD ($) / shares
$Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0so_RetirementBenefitsTablesAbstractsofalsenadurationRetirement Benefits.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse| 1falsefalsefalse00falsefalsefalsefalsefalse | Otherxbrli:stringItemTypestringRetirement Benefits.falsefalse
3false0so_WeightedAverageRatesAssumedInActuarialCalculationsUsedToDetermineBothBenefitObligationsAsOfMeasurementDateAndNetPeriodicCostsForPensionAndOtherPostretirementBenefitPlansTextBlocksofalsenadurationWeighted average rates assumed in actuarial calculations used to determine both benefit obligations as of measurement date...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table1 - so:WeightedAverageRatesAssumedInActuarialCalculationsUsedToDetermineBothBenefitObligationsAsOfMeasurementDateAndNetPeriodicCostsForPensionAndOtherPostretirementBenefitPlansTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="64%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right" colspan="2"><b>2010</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right" colspan="2">2009</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right" colspan="2">2008</td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Discount rate:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Pension plans
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>5.52</b></td>
<td nowrap="nowrap"><b>%</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">5.93</td>
<td nowrap="nowrap">%</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">6.75</td>
<td nowrap="nowrap">%</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Other postretirement benefit plans
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>5.40</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">5.83</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">6.75</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Annual salary increase
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>3.84</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">4.18</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3.75</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Long-term return on plan assets:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Pension plans
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>8.75</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">8.50</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">8.50</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Other postretirement benefit plans
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>7.40</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">7.51</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">7.59</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringWeighted average rates assumed in actuarial calculations used to determine both benefit obligations as of measurement date and net periodic costs for pension and other postretirement benefit plans text block.No authoritative reference available.falsefalse
4false0so_EffectOfOnePercentAnnualIncreaseOrDecreaseInAssumedMedicalCareCostOnAPBOAndServiceAndInterestCostComponentsTextBlocksofalsenadurationEffect Of One Percent Annual Increase Or Decrease In The Assumed Medical Care Cost On APBO And The Service And Interest Cost...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table2 - so:EffectOfOnePercentAnnualIncreaseOrDecreaseInAssumedMedicalCareCostOnAPBOAndServiceAndInterestCostComponentsTextBlock -->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>1 Percent</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>1 Percent</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Increase</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Decrease</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="8"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Benefit obligation
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">128</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">108</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Service and interest costs
</div></td>
<td> </td>
<td> </td>
<td align="right">7</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">6</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringEffect Of One Percent Annual Increase Or Decrease In The Assumed Medical Care Cost On APBO And The Service And Interest Cost Components.No authoritative reference available.falsefalse
5false0so_ChangesProjectedBenefitObligationsAndFairValueOfPlanAssetsTextBlocksofalsenadurationChanges projected benefit obligations and the fair value of plan assets.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table3 - so:ChangesProjectedBenefitObligationsAndFairValueOfPlanAssetsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="8"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Change in benefit obligation</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Benefit obligation at beginning of year
</div></td>
<td> </td>
<td align="left"><b>$</b></td>
<td align="right"><b>6,758</b></td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">5,879</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Service cost
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>172</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">146</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Interest cost
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>391</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">387</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Benefits paid
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(296</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(282</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Actuarial loss (gain)
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>198</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">628</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Balance at end of year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>7,223</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">6,758</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Change in plan assets</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Fair value of plan assets at beginning of year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>5,627</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">5,093</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Actual return (loss) on plan assets
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>859</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">792</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Employer contributions
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>644</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">24</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Benefits paid
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(296</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(282</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Fair value of plan assets at end of year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>6,834</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">5,627</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Accrued liability
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"><b>$</b></td>
<td align="right"><b>(389</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left">$</td>
<td align="right">(1,131</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringChanges projected benefit obligations and the fair value of plan assets.No authoritative reference available.falsefalse
6false0so_AmountsRecognizedInConsolidatedBalanceSheetsRelatedToCompanysPensionPlansTextBlocksofalsenadurationAmounts Recognized In The Consolidated Balance Sheets Related To The Companys Pension Plans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table4 - so:AmountsRecognizedInConsolidatedBalanceSheetsRelatedToCompanysPensionPlansTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Prepaid pension costs
</div></td>
<td> </td>
<td align="left"><b>$</b></td>
<td align="right"><b>88</b></td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Other regulatory assets, deferred
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>1,749</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1,894</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Other current liabilities
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(28</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(25</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Employee benefit obligations
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(449</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(1,106</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>68</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">74</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringAmounts Recognized In The Consolidated Balance Sheets Related To The Companys Pension Plans.No authoritative reference available.falsefalse
7false0so_AmountsRelatedToDefinedBenefitPensionPlansThatHadNotYetBeenRecognizedInNetPeriodicPensionCostAlongWithEstimatedAmortizationTextBlocksofalsenadurationAmounts Related To Defined Benefit Pension Plans That Had Not Yet Been Recognized In Net Periodic Pension Cost Along With...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table5 - so:AmountsRelatedToDefinedBenefitPensionPlansThatHadNotYetBeenRecognizedInNetPeriodicPensionCostAlongWithEstimatedAmortizationTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Prior Service Cost</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Net (Gain) Loss</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2010:</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>8</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>60</b></td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Regulatory assets
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>159</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>1,590</b></td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>167</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>1,650</b></td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom"><!-- Blank Space -->
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2009:</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">10</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">64</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Regulatory assets
</div></td>
<td> </td>
<td> </td>
<td align="right">188</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1,706</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">198</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,770</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom"><!-- Blank Space -->
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Estimated amortization in net periodic
pension cost in 2011:</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Regulatory assets
</div></td>
<td> </td>
<td> </td>
<td align="right">31</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">20</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">32</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">21</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringAmounts Related To Defined Benefit Pension Plans That Had Not Yet Been Recognized In Net Periodic Pension Cost Along With Estimated Amortization.No authoritative reference available.falsefalse
8false0so_ComponentsOfOtherComprehensiveIncomeAlongWithChangesInBalancesOfRegulatoryAssetsAndRegulatoryLiabilitiesRelatedToDefinedBenefitPensionPlansTextBlocksofalsenadurationComponents Of Other Comprehensive Income Along With Changes In Balances Of Regulatory Assets And Regulatory Liabilities...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table6 - so:ComponentsOfOtherComprehensiveIncomeAlongWithChangesInBalancesOfRegulatoryAssetsAndRegulatoryLiabilitiesRelatedToDefinedBenefitPensionPlansTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Accumulated</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Regulatory</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>OCI</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Assets</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2008</b>
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">54</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,579</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Net loss
</div></td>
<td> </td>
<td> </td>
<td align="right">21</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">355</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Change in prior service costs
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Reclassification adjustments:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of prior service costs
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(1</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(34</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of net gain
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(7</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Total reclassification adjustments
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(1</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(41</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total change
</div></td>
<td> </td>
<td> </td>
<td align="right">20</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">315</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2009</b>
</div></td>
<td> </td>
<td> </td>
<td align="right">74</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1,894</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Net gain
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(4</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(106</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Change in prior service costs
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>2</b></td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Reclassification adjustments:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of prior service costs
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(1</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(32</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of net gain
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(1</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(9</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Total reclassification adjustments
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(41</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total change
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(6</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(145</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2010</b>
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>68</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>1,749</b></td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringComponents Of Other Comprehensive Income Along With Changes In Balances Of Regulatory Assets And Regulatory Liabilities Related To Defined Benefit Pension Plans.No authoritative reference available.falsefalse
9false0so_ComponentsOfNetPeriodicPensionCostTextBlocksofalsenadurationComponents Of Net Periodic Pension Costfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table7 - so:ComponentsOfNetPeriodicPensionCostTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="64%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000">2008</td>
<td style="border-bottom: 1px solid #000000"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="12"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Service cost
</div></td>
<td> </td>
<td align="left"><b>$</b></td>
<td align="right"><b>172</b></td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">146</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">146</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Interest cost
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>391</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">387</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">348</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Expected return on plan assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(552</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(541</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(525</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Recognized net loss
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>10</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">7</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">9</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Net amortization
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>33</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">35</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">37</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Net periodic pension cost
</div></td>
<td> </td>
<td align="left"><b>$</b></td>
<td align="right"><b>54</b></td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">34</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">15</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringComponents Of Net Periodic Pension CostNo authoritative reference available.falsefalse
10false0so_EstimatedPensionBenefitPaymentsTextBlocksofalsenadurationEstimated pension benefit payments.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table8 - so:EstimatedPensionBenefitPaymentsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="88%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Benefit Payments</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><i style="font-size: 8pt">(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px">2011
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top">$</td>
<td align="right" valign="top">335</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr valign="bottom">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px">2012
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top">353</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px">2013
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top">372</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr valign="bottom">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px">2014
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top">392</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px">2015
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top">413</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr valign="bottom">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px">2016 to 2020
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top">2,368</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="5" valign="top" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringEstimated pension benefit payments.No authoritative reference available.falsefalse
11false0so_ChangesInAccumulatedPostretirementBenefitObligationsAndInFairValueOfPlanAssetsTextBlocksofalsenadurationChanges In The Accumulated Postretirement Benefit Obligations And In The Fair Value Of Plan Assets.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table9 - so:ChangesInAccumulatedPostretirementBenefitObligationsAndInFairValueOfPlanAssetsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="right" colspan="2" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Change in benefit obligation</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Benefit obligation at beginning of year
</div></td>
<td> </td>
<td align="left"><b>$</b></td>
<td align="right"><b>1,759</b></td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">1,733</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Service cost
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>25</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">26</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Interest cost
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>100</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">113</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Benefits paid
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(95</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(93</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Actuarial loss (gain)
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(41</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td> </td>
<td align="right">34</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Plan amendments
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(59</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Retiree drug subsidy
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>6</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Balance at end of year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>1,752</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1,759</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Change in plan assets</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Fair value of plan assets at beginning of year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>743</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">631</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Actual return (loss) on plan assets
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>82</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">127</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Employer contributions
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>66</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">72</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Benefits paid
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right"><b>(89</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(87</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Fair value of plan assets at end of year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>802</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">743</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Accrued liability
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"><b>$</b></td>
<td align="right"><b>(950</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="left">$</td>
<td align="right">(1,016</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringChanges In The Accumulated Postretirement Benefit Obligations And In The Fair Value Of Plan Assets.No authoritative reference available.falsefalse
12false0so_AmountsRecognizedInConsolidatedBalanceSheetsRelatedToCompanysOtherPostretirementBenefitPlansTextBlocksofalsenadurationAmounts Recognized In Consolidated Balance Sheets Related To Companys Other Postretirement benefit Plans TextBlock.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table10 - so:AmountsRecognizedInConsolidatedBalanceSheetsRelatedToCompanysOtherPostretirementBenefitPlansTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Other regulatory assets, deferred
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>292</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">374</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Other current liabilities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(1</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Employee benefit obligations
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(949</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(1,016</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>3</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringAmounts Recognized In Consolidated Balance Sheets Related To Companys Other Postretirement benefit Plans TextBlock.No authoritative reference available.falsefalse
13false0so_AmountsIncludedInAccumulatedOtherComprehensiveIncomeAndRegulatoryAssetsRelatedToOtherPostretirementBenefitPlansTextBlocksofalsenadurationAmounts included in accumulated other comprehensive income and regulatory assets related to the other postretirement benefit...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table11 - so:AmountsIncludedInAccumulatedOtherComprehensiveIncomeAndRegulatoryAssetsRelatedToOtherPostretirementBenefitPlansTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="64%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Prior Service</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Net (Gain)</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Transition</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Cost</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Loss</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Obligation</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="13"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2010:</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>3</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>—</b></td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Regulatory assets
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>34</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>233</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>25</b></td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>34</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>236</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>25</b></td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2009:</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Regulatory assets
</div></td>
<td> </td>
<td> </td>
<td align="right">41</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">298</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">35</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">41</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">303</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">35</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Estimated amortization as net periodic
postretirement benefit cost in 2011:</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Accumulated OCI
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Regulatory assets
</div></td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">4</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">4</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">10</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringAmounts included in accumulated other comprehensive income and regulatory assets related to the other postretirement benefit plans text block.No authoritative reference available.falsefalse
14false0so_ComponentsOfOtherComprehensiveIncomeAlongWithChangesInBalanceOfRegulatoryAssetsRelatedToOtherPostretirementBenefitPlansTextBlocksofalsenadurationComponents of other comprehensive income along with changes in balance of regulatory assets related to other postretirement...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table12 - so:ComponentsOfOtherComprehensiveIncomeAlongWithChangesInBalanceOfRegulatoryAssetsRelatedToOtherPostretirementBenefitPlansTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="76%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Accumulated</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Regulatory</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>OCI</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Assets</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2008</b>
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">8</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">489</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Net gain
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(33</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Change in prior service costs/transition obligation
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(3</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(56</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Reclassification adjustments:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of transition obligation
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(13</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of prior service costs
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(8</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of net gain
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(5</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total reclassification adjustments
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(26</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Total change
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(3</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(115</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2009</b>
</div></td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">374</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Net gain
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(<b>60</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Change in prior service costs/transition obligation
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Reclassification adjustments:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of transition obligation
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(10</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of prior service costs
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(5</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Amortization of net gain
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(5</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Total reclassification adjustments
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(20</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total change
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(82</b></td>
<td nowrap="nowrap"><b>)</b></td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Balance at December 31, 2010</b>
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>3</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>292</b></td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="9" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringComponents of other comprehensive income along with changes in balance of regulatory assets related to other postretirement benefit plans.No authoritative reference available.falsefalse
15false0so_ComponentsOfOtherPostretirementBenefitPlansNetPeriodicCostTextBlocksofalsenadurationComponents of other postretirement benefit plans net periodic cost text block.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table13 - so:ComponentsOfOtherPostretirementBenefitPlansNetPeriodicCostTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="64%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2008</td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="20"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Service cost
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>25</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">26</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">28</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Interest cost
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>100</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">113</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">111</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Expected return on plan assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(63</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(61</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(59</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Net amortization
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>20</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">25</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">31</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Net postretirement cost
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>82</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">103</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">111</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringComponents of other postretirement benefit plans net periodic cost text block.No authoritative reference available.falsefalse
16false0so_SummaryOfEstimationOfFutureBenefitPaymentsAndSubsidyReceiptsBasedOnAssumptionsUsedToMeasureAccumulatedBenefitObligationForPostretirementPlansTextBlocksofalsenadurationSummary of estimation of future benefit payments and subsidy receipts based on assumptions used to measure the accumulated...falsefalsefalsefalsefalsefalsefalsefalsefalsefalse| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table14 - so:SummaryOfEstimationOfFutureBenefitPaymentsAndSubsidyReceiptsBasedOnAssumptionsUsedToMeasureAccumulatedBenefitObligationForPostretirementPlansTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="64%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Benefit Payments</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Subsidy Receipts</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Total</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i>(in millions)</i></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">2011
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">108</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(8</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td align="right">$</td>
<td align="right">100</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">2012
</div></td>
<td> </td>
<td> </td>
<td align="right">114</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(9</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">105</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">2013
</div></td>
<td> </td>
<td> </td>
<td align="right">121</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(10</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">111</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">2014
</div></td>
<td> </td>
<td> </td>
<td align="right">127</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(12</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">115</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">2015
</div></td>
<td> </td>
<td> </td>
<td align="right">133</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(13</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">120</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">2016 to 2020
</div></td>
<td> </td>
<td> </td>
<td align="right">695</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(69</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">626</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringSummary of estimation of future benefit payments and subsidy receipts based on assumptions used to measure the accumulated benefit obligation for postretirement plans text block.No authoritative reference available.falsefalse
17false0so_CompositionOfPensionPlanAssetsAlongWithTargetedMixOfAssetsTextBlocksofalsenadurationComposition of Pension plan assets along with the targeted mix of assets.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table15 - so:CompositionOfPensionPlanAssetsAlongWithTargetedMixOfAssetsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="64%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">Target</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Pension plan assets:</b>
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Domestic equity
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">29</td>
<td nowrap="nowrap">%</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>29</b></td>
<td nowrap="nowrap"><b>%</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">33</td>
<td nowrap="nowrap">%</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">International equity
</div></td>
<td> </td>
<td> </td>
<td align="right">28</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>27</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">29</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Fixed income
</div></td>
<td> </td>
<td> </td>
<td align="right">15</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>22</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">15</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Special situations
</div></td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Real estate investments
</div></td>
<td> </td>
<td> </td>
<td align="right">15</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>13</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">13</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Private equity
</div></td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>9</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">100</td>
<td nowrap="nowrap">%</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>100</b></td>
<td nowrap="nowrap"><b>%</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">100</td>
<td nowrap="nowrap">%</td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="64%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="left" colspan="11"><b>Other postretirement benefit plan assets:</b></td>
<td> </td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Domestic equity
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">42</td>
<td nowrap="nowrap">%</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>40</b></td>
<td nowrap="nowrap"><b>%</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">37</td>
<td nowrap="nowrap">%</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">International equity
</div></td>
<td> </td>
<td> </td>
<td align="right">18</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>21</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">24</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Domestic fixed income
</div></td>
<td> </td>
<td> </td>
<td align="right">27</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>29</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">32</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Global fixed income
</div></td>
<td> </td>
<td> </td>
<td align="right">4</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>3</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Special situations
</div></td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Real estate investments
</div></td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>4</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">4</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Private equity
</div></td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>3</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">100</td>
<td nowrap="nowrap">%</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>100</b></td>
<td nowrap="nowrap"><b>%</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">100</td>
<td nowrap="nowrap">%</td>
</tr>
<tr style="font-size: 1px">
<td colspan="13" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringComposition of Pension plan assets along with the targeted mix of assets.No authoritative reference available.falsefalse
18false0so_FairValuesOfPensionPlanAssetsTextBlocksofalsenadurationThe fair values of pension plan assets.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table16 - so:FairValuesOfPensionPlanAssetsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="52%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>Fair Value Measurements Using</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Quoted Prices</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>in Active</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Markets for</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Other</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Identical</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Observable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Unobservable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Assets</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>As of December 31, 2010:</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 1)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 2)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 3)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Total</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="27"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Assets:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Domestic equity*
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">1,266</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">511</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,778</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">International equity*
</div></td>
<td> </td>
<td> </td>
<td align="right">1,277</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">443</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1,720</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Fixed income:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">U.S. Treasury, government, and agency bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">304</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">304</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Mortgage- and asset-backed securities
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">247</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">247</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Corporate bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">594</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">2</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">596</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Pooled funds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">201</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">201</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Cash equivalents and other
</div></td>
<td> </td>
<td> </td>
<td align="right">2</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">478</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">480</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Special situations
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Real estate investments
</div></td>
<td> </td>
<td> </td>
<td align="right">184</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">674</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">858</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Private equity
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">638</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">638</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">2,729</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">2,778</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,315</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">6,822</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Liabilities:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Derivatives
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(1</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(1</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">2,728</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">2,778</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,315</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">6,821</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr style="font-size: 6pt">
<td width="3%"> </td>
<td width="1%"> </td>
<td width="96%"> </td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">*</td>
<td> </td>
<td>Level 1 securities consist of actively traded stocks while Level 2 securities consist of
pooled funds. Management believes that the portfolio is well-diversified with no
significant concentrations of risk.</td>
</tr>
</table>
<!-- Folio -->
<!-- /Folio -->
<!-- PAGEBREAK -->
<div style="font-family: 'Times New Roman',Times,serif">
<div align="left" style="font-size: 10pt; margin-top: 0pt">
<b>
</b>
</div>
<div align="left" style="font-size: 10pt; margin-top: 0pt">
<b>
</b>
</div>
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="52%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>Fair Value Measurements Using</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Quoted Prices</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>in Active</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Markets for</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Other</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Identical</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Observable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Unobservable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 0px solid #000000"><b>Assets</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 0px solid #000000"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 0px solid #000000"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>As of December 31, 2009:</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 1)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 2)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 3)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Total</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="27"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Assets:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Domestic equity*
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">1,117</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">462</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,579</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">International equity*
</div></td>
<td> </td>
<td> </td>
<td align="right">1,444</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">144</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1,588</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Fixed income:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">U.S. Treasury, government, and agency bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">416</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">416</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Mortgage- and asset-backed securities
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">113</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">113</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Corporate bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">279</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">279</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Pooled funds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Cash equivalents and other
</div></td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">341</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">344</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Special situations
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Real estate investments
</div></td>
<td> </td>
<td> </td>
<td align="right">174</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">547</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">721</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Private equity
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">555</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">555</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">2,738</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,765</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,102</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">5,605</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Liabilities:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Derivatives
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(5</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(1</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(6</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">2,733</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,764</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,102</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">5,599</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr style="font-size: 6pt">
<td width="3%"> </td>
<td width="1%"> </td>
<td width="96%"> </td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">*</td>
<td> </td>
<td>Level 1 securities consist of actively traded stocks while Level 2 securities consist of
pooled funds. Management believes that the portfolio is well-diversified with no
significant concentrations of risk.</td>
</tr>
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringThe fair values of pension plan assets.No authoritative reference available.falsefalse
19false0so_ChangesInFairValueMeasurementOfLevelThreeItemsInPensionPlanAssetsTextBlocksofalsenadurationChanges in the fair value measurement of the Level Three items in the pension plan assets.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table17 - so:ChangesInFairValueMeasurementOfLevelThreeItemsInPensionPlanAssetsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="52%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7" style="border-bottom: 1px solid #000000">2009</td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Real Estate</b></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Real Estate</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Investments</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Private Equity</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Investments</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Private Equity</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="15"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Beginning balance
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>547</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>555</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">839</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">490</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Actual return on investments:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Related to investments held at year end
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>59</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>67</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(240</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">37</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Related to investments sold during the year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>18</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>18</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(65</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Total return on investments
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>77</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>85</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(305</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">47</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Purchases, sales, and settlements
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>50</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td> </td>
<td align="right">13</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">18</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Transfers into/out of Level 3
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Ending balance
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>674</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>638</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">547</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">555</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringChanges in the fair value measurement of the Level Three items in the pension plan assets.No authoritative reference available.falsefalse
20false0us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note2_table18 - us-gaap:ScheduleOfDefinedBenefitPlansDisclosuresTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="52%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>Fair Value Measurements Using</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Quoted Prices</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>in Active</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Markets for</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Other</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Identical</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Observable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Unobservable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Assets</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>As of December 31, 2010:</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 1)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 2)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 3)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Total</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="27"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Assets:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Domestic equity*
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">176</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">45</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">221</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">International equity*
</div></td>
<td> </td>
<td> </td>
<td align="right">49</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">50</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">99</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Fixed income:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">U.S. Treasury, government, and agency bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">15</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">15</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Mortgage- and asset-backed securities
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Corporate bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">23</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">23</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Pooled funds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">34</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">34</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Cash equivalents and other
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">41</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">41</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Trust-owned life insurance
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">291</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">291</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Special situations
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Real estate investments
</div></td>
<td> </td>
<td> </td>
<td align="right">7</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">26</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">33</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Private equity
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">23</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">23</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">232</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">509</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">49</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">790</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr style="font-size: 6pt">
<td width="3%"> </td>
<td width="1%"> </td>
<td width="96%"> </td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">*</td>
<td> </td>
<td>Level 1 securities consist of actively traded stocks while Level 2 securities consist of
pooled funds. Management believes that the portfolio is well-diversified with no
significant concentrations of risk.</td>
</tr>
</table>
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="52%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>Fair Value Measurements Using</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Quoted Prices</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>in Active</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Markets for</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Other</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Significant</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Identical</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Observable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Unobservable</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Assets</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Inputs</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>As of December 31, 2009:</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 1)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 2)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>(Level 3)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Total</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="27"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Assets:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Domestic equity*
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">149</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">42</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">191</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">International equity*
</div></td>
<td> </td>
<td> </td>
<td align="right">62</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">36</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">98</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Fixed income:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">U.S. Treasury, government, and agency bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">22</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">22</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Mortgage- and asset-backed securities
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Corporate bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">12</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">12</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Pooled funds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">18</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">18</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Cash equivalents and other
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">54</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">54</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Trust-owned life insurance
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">270</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">270</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Special situations
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Real estate investments
</div></td>
<td> </td>
<td> </td>
<td align="right">7</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">24</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">31</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Private equity
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">24</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">24</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">218</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">459</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">48</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">725</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr style="font-size: 6pt">
<td width="3%"> </td>
<td width="1%"> </td>
<td width="96%"> </td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">*</td>
<td> </td>
<td>Level 1 securities consist of actively traded stocks while Level 2 securities consist of
pooled funds. Management believes that the portfolio is well-diversified with no
significant concentrations of risk.</td>
</tr>
</table>
</div>
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<!-- Begin Block Tagged Note Table: SO-20101231_note2_table19 - us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="52%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="7" style="border-bottom: 1px solid #000000">2009</td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Real Estate</b></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Real Estate</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Investments</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Private Equity</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Investments</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Private Equity</b></td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="15"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Beginning balance
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>24</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>24</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">36</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">21</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Actual return on investments:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Related to investments held at year end
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>2</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>1</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(10</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">2</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Related to investments sold during the year
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(3</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Total return on investments
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>2</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>1</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(13</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">2</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Purchases, sales, and settlements
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Transfers into/out of Level 3
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Ending balance
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>26</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>23</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">24</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">24</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringThis element represents, for the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs).Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c
falsefalse
120Retirement Benefits (Tables)UnKnownUnKnownUnKnownUnKnownfalsetrue