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<div style="font-family: 'Times New Roman',Times,serif">
<div align="left" style="font-size: 10pt; margin-top: 12pt"><b>12. Employee Retirement Plans</b>
</div>
<div align="left" style="font-size: 10pt; margin-top: 6pt">The components of net pension and postretirement benefits costs are summarized in the following 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="52%"> </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>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6">Three Months </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6">Nine Months</td>
<td> </td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="6" style="border-bottom: 1px solid #000000">ended September 30,</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="6" style="border-bottom: 1px solid #000000">ended September 30,</td>
<td style="border-bottom: 1px solid #000000"> </td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td nowrap="nowrap" align="left"><i>(millions)</i></td>
<td> </td>
<td nowrap="nowrap" align="right" colspan="2">2010</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">2010</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right" colspan="2">2009</td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<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:15px; text-indent:-15px"><i>Pension:</i>
</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:15px; text-indent:-15px">Service cost of benefits earned
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">7</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">7</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">20</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">20</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Interest cost on projected benefit obligation
</div></td>
<td> </td>
<td> </td>
<td align="right">16</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">17</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">48</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">51</td>
<td> </td>
</tr>
<tr valign="bottom">
<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">(16</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(17</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(49</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(51</td>
<td nowrap="nowrap">)</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">3</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">11</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3</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">Net pension cost
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">10</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">8</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">30</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">23</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"><!-- 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"><i>Postretirement:</i>
</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:15px; text-indent:-15px">Service cost of benefits earned
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">2</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">6</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Interest cost on projected benefit obligation
</div></td>
<td> </td>
<td> </td>
<td align="right">4</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">13</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">14</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Net amortization
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(4</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(4</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(13</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(9</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" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Net postretirement cost
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">11</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 align="left" style="font-size: 10pt; margin-top: 6pt">     During the first nine months of 2010, we made contributions to our pension plans that
were recorded on the condensed consolidated balance sheet at $43.5 million. These contributions
consisted of approximately $0.9 million in cash and 3,271,405 shares of our common stock held in
treasury, or the Contributed Shares. The Contributed Shares were contributed to the USG Corporation
Retirement Plan Trust, or the Trust, and recorded on the condensed consolidated balance sheet at
the September 7, 2010 closing price of $13.03 per share, or approximately $42.6
million in the aggregate. The Contributed Shares are not reflected on the condensed consolidated
statement of cash flows because they were treated as a noncash financing activity. The Contributed
Shares were valued for purposes of crediting the contribution to the Trust at a discounted value of
$12.38 per share ($13.03 less 5%), or approximately $40.5 million in the aggregate, by an
independent appraiser retained by Evercore Trust Company, N.A., or Evercore, an independent
fiduciary that has been appointed as investment manager with respect to the Contributed Shares.
Resale of the Contributed Shares is registered, and Evercore has authority to sell some or all of
them at its discretion as fiduciary.
</div>
<div align="left" style="font-size: 10pt; margin-top: 6pt">     As of the date of this report, we believe that the Patient Protection and Affordable Care Act
and a reconciliation measure, the Health Care and Education Reconciliation Act of 2010,
(collectively, the Act) will not have a material impact on our results of operations, financial
position or cash flows. However, we are continuing to evaluate the provisions of the Act and
ongoing, related regulatory activity to determine their potential impact, if any, on our health
care benefit costs.
</div>
</div>
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