<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><Version>2.2.0.25</Version><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><ReportLongName>0222 - Disclosure - Interest Income (Expense), Net</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>1/1/2010 - 12/31/2010
USD ($)

USD ($) / shares

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    &lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;
    &lt;!-- Begin Block Tagged Note 22 - us-gaap:InterestIncomeAndInterestExpenseDisclosureTextBlock--&gt;
    &lt;div style="margin-left: 0%"&gt;
    &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
    &lt;/div&gt;
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    &lt;b&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;22.&amp;#160;&amp;#160;&lt;/font&gt;&lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &lt;b&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;INTEREST
    INCOME (EXPENSE), NET&lt;/font&gt;&lt;/b&gt;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;/table&gt;
    &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
    &lt;/div&gt;
    &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
    Interest income (expense), net consisted of the following:
    &lt;/div&gt;
    &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
    &lt;/div&gt;
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    &lt;!-- Table Width Row BEGIN --&gt;
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    &lt;td width="1%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=03 type=lead --&gt;
    &lt;td width="9%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=03 type=body --&gt;
    &lt;td width="1%" align="left"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=03 type=hang1 --&gt;
    &lt;td width="3%"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=gutter --&gt;
    &lt;td width="1%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=lead --&gt;
    &lt;td width="9%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=body --&gt;
    &lt;td width="1%" align="left"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=hang1 --&gt;
    &lt;/tr&gt;
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    &lt;!-- TableOutputHead --&gt;
    &lt;tr style="font-size: 8pt" valign="bottom" align="center"&gt;
    &lt;td nowrap="nowrap" align="center" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom"&gt;
    &lt;b&gt;Year Ended&lt;br /&gt;
    &lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom"&gt;
    &lt;b&gt;Year Ended&lt;br /&gt;
    &lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom"&gt;
    &lt;b&gt;Year Ended&lt;br /&gt;
    &lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr style="font-size: 8pt" valign="bottom" align="center"&gt;
    &lt;td nowrap="nowrap" align="center" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom"&gt;
    &lt;b&gt;December&amp;#160;31,&lt;br /&gt;
    &lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom"&gt;
    &lt;b&gt;December&amp;#160;31,&lt;br /&gt;
    &lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom"&gt;
    &lt;b&gt;December&amp;#160;31,&lt;br /&gt;
    &lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr style="font-size: 8pt" valign="bottom" align="center"&gt;
    &lt;td nowrap="nowrap" align="center" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"&gt;
    &lt;b&gt;2010&lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"&gt;
    &lt;b&gt;2009&lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"&gt;
    &lt;b&gt;2008&lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr style="line-height: 3pt; font-size: 1pt"&gt;
    &lt;td&gt;&amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;!-- TableOutputBody --&gt;
    &lt;tr valign="bottom" style="background: #cceeff"&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &lt;div style="text-indent: -10pt; margin-left: 10pt"&gt;
    Income
    &lt;/div&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    &lt;b&gt;31&lt;/b&gt;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    59
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    132
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr valign="bottom"&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &lt;div style="text-indent: -10pt; margin-left: 10pt"&gt;
    Expense
    &lt;/div&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    &lt;b&gt;(34&lt;/b&gt;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &lt;b&gt;)&lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    (50
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    )
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    (81
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    )
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr valign="bottom" style="font-size: 1pt"&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 1px solid #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 1px solid #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 1px solid #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 1px solid #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 1px solid #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 1px solid #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr valign="bottom" style="background: #cceeff"&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &lt;div style="text-indent: -10pt; margin-left: 10pt"&gt;
    &lt;b&gt;Total&lt;/b&gt;
    &lt;/div&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    &lt;b&gt;(3&lt;/b&gt;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &lt;b&gt;)&lt;/b&gt;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    9
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
    51
    &lt;/td&gt;
    &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr valign="bottom" style="font-size: 1pt"&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 3px double #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 3px double #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 3px double #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 3px double #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 3px double #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td style="border-top: 3px double #000000"&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;td&gt;
    &amp;#160;
    &lt;/td&gt;
    &lt;/tr&gt;
    &lt;/table&gt;
    &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
    &lt;/div&gt;
    &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
    &lt;/div&gt;
    &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
    No borrowing cost was capitalized in 2010, 2009 and 2008.
    Interest income on floating rate notes classified as
    &lt;font style="white-space: nowrap"&gt;available-for-sale&lt;/font&gt;
    marketable securities amounted to $3&amp;#160;million for the year
    ended December&amp;#160;31, 2010, $8&amp;#160;million for the year ended
    December&amp;#160;31, 2009 and to $37&amp;#160;million for the year
    ended December&amp;#160;31, 2008. Interest income on auction rate
    securities totaled $2&amp;#160;million, $7&amp;#160;million and
    $14&amp;#160;million for the years ended December&amp;#160;31, 2010,
    2009 and 2008 respectively. Interest income on Numonyx long term
    notes classified as
    &lt;font style="white-space: nowrap"&gt;available-for-sale&lt;/font&gt;
    until May&amp;#160;7, 2010 amounted to $5&amp;#160;million,
    $16&amp;#160;million and $11&amp;#160;million for the year ended
    December&amp;#160;31, 2010, 2009 and 2008 respectively.
    &lt;/div&gt;
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    &lt;div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"&gt;
    &lt;b&gt;
    &lt;font style="font-family: 'Times New Roman', Times"&gt;
    &lt;/font&gt;
    &lt;/b&gt;
    &lt;/div&gt;
    &lt;div style="margin-top: 0pt; font-size: 1pt"&gt;
    &lt;/div&gt;
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    &lt;/div&gt;
  </NonNumbericText><NonNumericTextHeader>&lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;
    &lt;!-- Begin Block Tagged Note</NonNumericTextHeader><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>us-types:textBlockItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>This text block may contain information related to interest income and interest expense for enterprises that derive a significant portion of their revenue from interest collected on investments, loans, and securities.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 04
 -Paragraph 1 - 9
 -Article 9

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