2.2.0.25falsefalse0510 - Disclosure - Fair Value Measurements (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_FairValueMeasurementsTablesAbstractsofalsenadurationFair Value Measurements.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse| 1falsefalsefalse00falsefalsefalsefalsefalse | Otherxbrli:stringItemTypestringFair Value Measurements.falsefalse
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<!-- Begin Block Tagged Note Table: SO-20101231_note10_table1 - us-gaap:FairValueMeasurementInputsDisclosureTextBlock-->
<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: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="15"><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">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">Energy-related derivatives
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">10</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">10</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Interest rate derivatives
</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">
<td>
<div style="margin-left:30px; text-indent:-15px">Foreign currency derivatives
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Nuclear decommissioning trusts:<sup style="font-size: 85%; vertical-align: text-top">(a)</sup>
</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:45px; text-indent:-15px">Domestic equity
</div></td>
<td> </td>
<td> </td>
<td align="right">604</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">60</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">664</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">U.S.
Treasury and government agency securities
</div></td>
<td> </td>
<td> </td>
<td align="right">20</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">220</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">240</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Municipal bonds
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">53</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">53</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">220</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">220</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">119</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">119</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Other
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">74</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">74</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Cash equivalents and restricted cash
</div></td>
<td> </td>
<td> </td>
<td align="right">351</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">351</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Other
</div></td>
<td> </td>
<td> </td>
<td align="right">9</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">51</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">19</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">79</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">984</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">820</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">19</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">1,823</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="top"><!-- Blank Space -->
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Liabilities:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Energy-related derivatives
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">206</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">206</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Interest rate derivatives
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="17" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">207</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">207</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 style="margin-top: 3pt">
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr>
<td width="3%"></td>
<td width="1%"></td>
<td width="96%"></td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">(a)</td>
<td> </td>
<td>Includes the investment securities pledged to creditors and collateral received,
and excludes receivables related to investment income, pending investment sales, and payables
related to pending investment purchases and the lending pool. See Note 1 under “Nuclear
Decommissioning” for additional information.</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:textBlockItemTypestringThis element represents the disclosure related to the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) 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); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 33
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 6
-Footnote 4
falsefalse
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<!-- Begin Block Tagged Note Table: SO-20101231_note10_table2 - so:FairValueMeasurementsOfInvestmentsCalculatedAtNetAssetValuePerShareAsWellAsNatureAndRiskOfThoseInvestmentsTextBlock-->
<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="45%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="3%"> </td>
<td width="12%"> </td>
<td width="1%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Fair</b></td>
<td> </td>
<td nowrap="nowrap" align="center"><b>Unfunded</b></td>
<td> </td>
<td nowrap="nowrap" align="center"><b>Redemption</b></td>
<td> </td>
<td nowrap="nowrap" align="center"><b>Redemption</b></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>Value</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Commitments</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Frequency</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Notice Period</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>
<td> </td>
<td> </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">Nuclear decommissioning trusts:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Corporate bonds – commingled funds
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">65</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom">None</td>
<td> </td>
<td align="center" valign="bottom">Daily</td>
<td> </td>
<td align="center" valign="bottom">1 to 3 days</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Other – commingled funds
</div></td>
<td> </td>
<td> </td>
<td align="right">67</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom">None</td>
<td> </td>
<td align="center" valign="bottom">Daily</td>
<td> </td>
<td align="center" valign="bottom">Not applicable</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">86</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom">None</td>
<td> </td>
<td align="center" valign="bottom">Daily</td>
<td> </td>
<td align="center" valign="bottom">15 days</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Cash equivalents and restricted cash:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Money market funds
</div></td>
<td> </td>
<td> </td>
<td align="right">351</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom">None</td>
<td> </td>
<td align="center" valign="bottom">Daily</td>
<td> </td>
<td align="center" valign="bottom" nowrap="nowrap">Not applicable</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Other:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Money market funds
</div></td>
<td> </td>
<td> </td>
<td align="right">2</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom">None</td>
<td> </td>
<td align="center" valign="bottom">Daily</td>
<td> </td>
<td align="center" valign="bottom">Not applicable</td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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5false0so_ChangesInFairValueMeasurementOfLevel3ItemsTextBlocksofalsenadurationChanges in the fair value measurement of the Level 3 items.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
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<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> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Level 3</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>Other</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>
<div style="margin-left:15px; text-indent:-15px">Beginning balance at December 31, 2009
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">35</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Total gains (losses) — realized/unrealized:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Included in earnings
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(1</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:45px; text-indent:-15px">Included in OCI
</div></td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:45px; text-indent:-15px">Transfers out of Level 3
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(20</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="5" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Ending balance at December 31, 2010</b>
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>19</b></td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="5" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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6false0so_FinancialInstrumentsNotHavingCarryingAmountEqualToFairValueTextBlocksofalsenadurationFinancial instruments not having carrying amount equal to fair value Text Block.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
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<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>Carrying Amount</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Fair Value</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11"><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">Long-term debt:
</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:75px; text-indent:-15px"><b>2010</b>
</div></td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>19,356</b></td>
<td> </td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>20,073</b></td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:75px; text-indent:-15px">2009
</div></td>
<td> </td>
<td align="right">$</td>
<td align="right">19,145</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">19,567</td>
<td> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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15Fair Value Measurements (Tables)UnKnownUnKnownUnKnownUnKnownfalsetrue