2.2.0.25falsefalse32103 - Disclosure - Valuation Accounts and Reserves (Tables)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($)
USD ($) / shares
$Duration_1_1_2010_To_12_31_2010http://www.sec.gov/CIK0000024741duration2010-01-01T00:00:002010-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0glw_ValuationAccountsAndReservesAbstractglwfalsenadurationValuation Accounts And Reserves [Abstract]falsefalsefalsefalsefalsefalsefalsefalsefalsefalse| 1falsefalsefalse00falsefalsefalsefalsefalse | Otherxbrli:stringItemTypestringValuation Accounts And Reserves [Abstract]falsefalse
3false0glw_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlockglwfalsenadurationSchedule Of Valuation And Qualifying Accounts Disclosure Table Text Blockfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel| 1falsefalsefalse00<div> <table border="0" cellspacing="0">
<tr valign="bottom"><td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td></tr>
<tr valign="bottom"><td style="border-bottom: #000000 1px solid;" align="left"><font class="_mt" size="2">(in millions)</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="right"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td></tr>
<tr><td colspan="10"> </td></tr>
<tr><td colspan="10"> </td></tr>
<tr valign="bottom"><td align="left"> </td>
<td align="left"> </td>
<td align="right"><b><font class="_mt" size="2">Balance at</font></b></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><b><font class="_mt" size="2">Net</font></b></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="right"><b><font class="_mt" size="2">Balance at</font></b></td></tr>
<tr valign="bottom"><td align="left"> </td>
<td align="left"> </td>
<td align="center"><b><font class="_mt" size="2">beginning</font></b></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="right"><b><font class="_mt" size="2">deductions</font></b></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><b><font class="_mt" size="2">end</font></b></td></tr>
<tr valign="bottom"><td style="border-bottom: #000000 1px solid; text-indent: 1px;" align="left"><b><font class="_mt" size="2">Year ended December 31, 2010</font></b></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="center"><b><font class="_mt" size="2">of period</font></b></td>
<td style="border-bottom: #000000 1px solid;" align="right"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"><b><font class="_mt" size="2">Additions</font></b></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="right"><b><font class="_mt" size="2">and other</font></b></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="center"><b><font class="_mt" size="2">of period</font></b></td></tr>
<tr><td colspan="10"> </td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Doubtful accounts and allowances</font></td>
<td align="left"><b><font class="_mt" size="2">$</font></b></td>
<td align="right"><b><font class="_mt" size="2">20</font></b></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"><b><font class="_mt" size="2">$</font></b></td>
<td align="right"><b><font class="_mt" size="2">20</font></b></td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Deferred tax assets valuation allowance</font></td>
<td align="left"><b><font class="_mt" size="2">$</font></b></td>
<td align="right"><b><font class="_mt" size="2">245</font></b></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"><b><font class="_mt" size="2">$</font></b></td>
<td align="right"><b><font class="_mt" size="2">31</font></b></td>
<td align="left"> </td>
<td align="left"><b><font class="_mt" size="2">$</font></b></td>
<td align="right"><b><font class="_mt" size="2">214</font></b></td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Accumulated amortization of purchased intangible assets</font></td>
<td align="left"><b><font class="_mt" size="2">$</font></b></td>
<td align="right"><b><font class="_mt" size="2">217</font></b></td>
<td align="right"><b><font class="_mt" size="2">$</font></b></td>
<td style="text-indent: 1px;" align="left"><b><font class="_mt" size="2">4</font></b></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"><b><font class="_mt" size="2">$</font></b></td>
<td align="right"><b><font class="_mt" size="2">221</font></b></td></tr>
<tr valign="bottom"><td style="border-bottom: #000000 3px double; text-indent: 1px;" align="left"><font class="_mt" size="2">Reserves for accrued costs of business restructuring</font></td>
<td style="border-bottom: #000000 3px double;" align="left"><b><font class="_mt" size="2">$</font></b></td>
<td style="border-bottom: #000000 3px double;" align="right"><b><font class="_mt" size="2">100</font></b></td>
<td style="border-bottom: #000000 3px double;" align="right"> </td>
<td style="border-bottom: #000000 3px double;" align="left"> </td>
<td style="border-bottom: #000000 3px double;" align="left"><b><font class="_mt" size="2">$</font></b></td>
<td style="border-bottom: #000000 3px double;" align="right"><b><font class="_mt" size="2">73</font></b></td>
<td style="border-bottom: #000000 3px double;" align="left"> </td>
<td style="border-bottom: #000000 3px double;" align="left"><b><font class="_mt" size="2">$</font></b></td>
<td style="border-bottom: #000000 3px double;" align="right"><b><font class="_mt" size="2">27</font></b></td></tr>
<tr><td colspan="10"> </td></tr>
<tr><td colspan="10"> </td></tr>
<tr valign="bottom"><td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">Balance at</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">Net</font></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">Balance at</font></td></tr>
<tr valign="bottom"><td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">beginning</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="right"><font class="_mt" size="2">deductions</font></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">end</font></td></tr>
<tr valign="bottom"><td style="border-bottom: #000000 1px solid; text-indent: 1px;" align="left"><font class="_mt" size="2">Year ended December 31, 2009</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="center"><font class="_mt" size="2">of period</font></td>
<td style="border-bottom: #000000 1px solid;" align="right"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"><font class="_mt" size="2">Additions</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="right"><font class="_mt" size="2">and other</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="center"><font class="_mt" size="2">of period</font></td></tr>
<tr><td colspan="10"> </td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Doubtful accounts and allowances</font></td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">20</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">20</font></td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Deferred tax assets valuation allowance</font></td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">230</font></td>
<td align="right"><font class="_mt" size="2">$</font></td>
<td style="text-indent: 1px;" align="left"><font class="_mt" size="2">15</font></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">245</font></td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Accumulated amortization of purchased intangible assets</font></td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">204</font></td>
<td align="right"><font class="_mt" size="2">$</font></td>
<td style="text-indent: 1px;" align="left"><font class="_mt" size="2">13</font></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">217</font></td></tr>
<tr valign="bottom"><td style="border-bottom: #000000 3px double; text-indent: 1px;" align="left"><font class="_mt" size="2">Reserves for accrued costs of business restructuring</font></td>
<td style="border-bottom: #000000 3px double;" align="left"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 3px double;" align="right"><font class="_mt" size="2">34</font></td>
<td style="border-bottom: #000000 3px double;" align="right"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 3px double; text-indent: 1px;" align="left"><font class="_mt" size="2">209</font></td>
<td style="border-bottom: #000000 3px double;" align="left"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 3px double;" align="right"><font class="_mt" size="2">143</font></td>
<td style="border-bottom: #000000 3px double;" align="left"> </td>
<td style="border-bottom: #000000 3px double;" align="left"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 3px double;" align="right"><font class="_mt" size="2">100</font></td></tr>
<tr><td colspan="10"> </td></tr>
<tr><td colspan="10"> </td></tr>
<tr valign="bottom"><td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">Balance at</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">Net</font></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">Balance at</font></td></tr>
<tr valign="bottom"><td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">beginning</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="right"><font class="_mt" size="2">deductions</font></td>
<td align="left"> </td>
<td align="left"> </td>
<td align="center"><font class="_mt" size="2">end</font></td></tr>
<tr valign="bottom"><td style="border-bottom: #000000 1px solid; text-indent: 1px;" align="left"><font class="_mt" size="2">Year ended December 31, 2008</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="center"><font class="_mt" size="2">of period</font></td>
<td style="border-bottom: #000000 1px solid;" align="right"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"><font class="_mt" size="2">Additions</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="right"><font class="_mt" size="2">and other</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="left"> </td>
<td style="border-bottom: #000000 1px solid;" align="center"><font class="_mt" size="2">of period</font></td></tr>
<tr><td colspan="10"> </td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Doubtful accounts and allowances</font></td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">20</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">20</font></td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Deferred tax assets valuation allowance</font></td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">3,181</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">2,951</font></td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">230</font></td></tr>
<tr valign="bottom"><td style="text-indent: 1px;" align="left"><font class="_mt" size="2">Accumulated amortization of purchased intangible assets</font></td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">210</font></td>
<td align="right"> </td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">6</font></td>
<td align="left"> </td>
<td align="left"><font class="_mt" size="2">$</font></td>
<td align="right"><font class="_mt" size="2">204</font></td></tr>
<tr valign="bottom"><td style="border-bottom: #000000 1px solid; text-indent: 1px;" align="left"><font class="_mt" size="2">Reserves for accrued costs of business restructuring</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 1px solid;" align="right"><font class="_mt" size="2">34</font></td>
<td style="border-bottom: #000000 1px solid;" align="right"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 1px solid; text-indent: 1px;" align="left"><font class="_mt" size="2">19</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 1px solid;" align="right"><font class="_mt" size="2">(19</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"><font class="_mt" size="2">)</font></td>
<td style="border-bottom: #000000 1px solid;" align="left"><font class="_mt" size="2">$</font></td>
<td style="border-bottom: #000000 1px solid;" align="right"><font class="_mt" size="2">34</font></td></tr></table> </div>
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12Valuation Accounts and Reserves (Tables)UnKnownUnKnownUnKnownUnKnownfalsetrue