1.0.0.3falseCommon stockfalse1$falsefalseSharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso4217020us-gaap_ClassOfStockDisclosuresAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalseNo definition available.false31us-gaap_ScheduleOfStockByClassTextBlockus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse00<table cellpadding="0" style="BORDER-COLLAPSE: collapse" cellspacing="0" border="0" width="100%">
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<td valign="top" align="left" width="4%"><font style="FONT-FAMILY: Times New Roman" size="2"><b>(19) </b></font></td>
<td valign="top" align="left"><font style="FONT-FAMILY: Times New Roman" size="2"><b>Common stock </b></font></td></tr></table>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 4%"><font style="FONT-FAMILY: Times New Roman" size="2">On January 20, 2010, our shareholders approved proposals to increase the authorized number of Class B common shares from 55,000,000 to 3,225,000,000 and to effect a 50-for-1 split of the Class B common stock which became effective on January 21, 2010. The Class A common stock was not split. Thereafter, each share of Class A common stock became convertible, at the option of the holder, into 1,500 shares of Class B common stock. Class B common stock is not convertible into Class A common stock. The Class B share data in the following table and the related disclosures regarding Class B shares are presented on a post-split basis for all periods. </font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 4%"><font style="FONT-FAMILY: Times New Roman" size="2">Changes in issued and outstanding Berkshire common stock during the three years ended December 31, 2009 are shown in the table below. </font></p>
<p style="MARGIN-TOP: 0px; FONT-SIZE: 12px; MARGIN-BOTTOM: 0px"> </p>
<table cellpadding="0" cellspacing="0" align="center" border="0" width="100%">
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<td width="56%"/>
<td valign="bottom" width="14%"/>
<td/>
<td/>
<td valign="bottom" width="14%"/>
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<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Class A, $5 Par Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Class B, $0.0033 Par Value</b></font></td></tr>
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<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>(1,650,000 shares authorized)<br/>
Shares Issued and Outstanding</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>(3,225,000,000 shares authorized)<br/>
Shares Issued and Outstanding</b></font></td></tr>
<tr bgcolor="#cceeff">
<td valign="top">
<p style="MARGIN-LEFT: 1em; TEXT-INDENT: -1em"><font style="FONT-FAMILY: Times New Roman" size="2">Balance December 31, 2006</font></p></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,117,568</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">637,621,550</font></td></tr>
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<td valign="top">
<p style="MARGIN-LEFT: 1em; TEXT-INDENT: -1em"><font style="FONT-FAMILY: Times New Roman" size="2">Conversions of Class A common stock to Class B common stock and other</font></p></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(36,544</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">62,382,450</font></td></tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"/>
<td valign="bottom">  </td>
<td style="BORDER-TOP: #000000 1px solid" valign="bottom"> </td>
<td> </td>
<td valign="bottom"> </td>
<td style="BORDER-TOP: #000000 1px solid" valign="bottom"> </td></tr>
<tr bgcolor="#cceeff">
<td valign="top">
<p style="MARGIN-LEFT: 1em; TEXT-INDENT: -1em"><font style="FONT-FAMILY: Times New Roman" size="2">Balance December 31, 2007</font></p></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,081,024</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">700,004,000</font></td></tr>
<tr>
<td valign="top">
<p style="MARGIN-LEFT: 1em; TEXT-INDENT: -1em"><font style="FONT-FAMILY: Times New Roman" size="2">Conversions of Class A common stock to Class B common stock and other</font></p></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(22,023</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">35,345,800</font></td></tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"/>
<td valign="bottom">  </td>
<td style="BORDER-TOP: #000000 1px solid" valign="bottom"> </td>
<td> </td>
<td valign="bottom"> </td>
<td style="BORDER-TOP: #000000 1px solid" valign="bottom"> </td></tr>
<tr bgcolor="#cceeff">
<td valign="top">
<p style="MARGIN-LEFT: 1em; TEXT-INDENT: -1em"><font style="FONT-FAMILY: Times New Roman" size="2">Balance December 31, 2008</font></p></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,059,001</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">735,349,800</font></td></tr>
<tr>
<td valign="top">
<p style="MARGIN-LEFT: 1em; TEXT-INDENT: -1em"><font style="FONT-FAMILY: Times New Roman" size="2">Conversions of Class A common stock to Class B common stock and other</font></p></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(3,720</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">9,351,500</font></td></tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"/>
<td valign="bottom">  </td>
<td style="BORDER-TOP: #000000 1px solid" valign="bottom"> </td>
<td> </td>
<td valign="bottom"> </td>
<td style="BORDER-TOP: #000000 1px solid" valign="bottom"> </td></tr>
<tr bgcolor="#cceeff">
<td valign="top">
<p style="MARGIN-LEFT: 1em; TEXT-INDENT: -1em"><font style="FONT-FAMILY: Times New Roman" size="2">Balance December 31, 2009</font></p></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,055,281</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">744,701,300</font></td></tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"/>
<td valign="bottom">  </td>
<td style="BORDER-TOP: #000000 3px double" valign="bottom"> </td>
<td> </td>
<td valign="bottom"> </td>
<td style="BORDER-TOP: #000000 3px double" valign="bottom"> </td></tr></table>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 4%"><font style="FONT-FAMILY: Times New Roman" size="2">Class B common stock possesses dividend and distribution rights equal to one-fifteen-hundredth (1/1,500) of such rights of Class A common stock. Each Class A common share is entitled to one vote per share. Each Class B common share possesses voting rights equivalent to one-ten-thousandth (1/10,000) of the voting rights of a Class A share. Unless otherwise required under Delaware General Corporation Law, Class A and Class B common shares vote as a single class. </font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 4%"><font style="FONT-FAMILY: Times New Roman" size="2">On an equivalent Class A common stock basis, there were 1,551,749 shares outstanding as of December 31, 2009 and 1,549,234 shares outstanding as of December 31, 2008. The Class B stock split had no effect on the number of equivalent Class A common shares outstanding. In addition to our common stock, we have 1,000,000 shares of preferred stock authorized, none of which are issued and outstanding.</font></p>(19) 
Common stock
On January 20, 2010, our shareholders approved proposals to increase the authorized number of Class B common shares fromfalsefalseNo definition available.No authoritative reference available.falsefalse12falseUnKnownUnKnownUnKnownfalsetrue