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USD ($)

USD ($) / shares

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USD ($)

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3/31/2011
USD ($)
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USD ($)
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1/1/2011 - 3/31/2011
USD ($)

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3/31/2011
SAR (&amp;#xfdfc;)

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12/31/2010
USD ($)
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USD ($)
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BRL
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USD ($)
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1/1/2010 - 12/31/2010
BRL
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1/1/2011 - 3/31/2011
USD ($)
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1/1/2011 - 3/31/2011
BRL
</KeyName><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2011_To_3_31_2011_us-gaap_StatementGeographicalAxis_aa_EstreitoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2011-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2011-03-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Estreito Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_EstreitoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit13</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>BRL</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>BRL</CurrencyCode><OriginalCurrencyCode>BRL</OriginalCurrencyCode></MCU><CurrencySymbol /><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2011" /><Label Id="3" Label="Estreito Project [Member]" /><Label Id="4" Label="BRL" /></Labels></Column><Column><Id>17</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Estreito Project [Member]
1/1/2010 - 3/31/2010
USD ($)
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Duration_1_1_2010_To_3_31_2010_us-gaap_StatementGeographicalAxis_aa_EstreitoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2010-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2010-03-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Estreito Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_EstreitoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit12</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2010" /><Label Id="3" Label="Estreito Project [Member]" /><Label Id="4" Label="USD ($)" /></Labels></Column><Column><Id>18</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>BRL</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Estreito Project [Member]
1/1/2010 - 3/31/2010
BRL
</KeyName><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2010_To_3_31_2010_us-gaap_StatementGeographicalAxis_aa_EstreitoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2010-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2010-03-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Estreito Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_EstreitoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit13</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>BRL</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>BRL</CurrencyCode><OriginalCurrencyCode>BRL</OriginalCurrencyCode></MCU><CurrencySymbol /><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2010" /><Label Id="3" Label="Estreito Project [Member]" /><Label Id="4" Label="BRL" /></Labels></Column><Column><Id>19</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode /><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Estreito Project [Member]
{dei_LegalEntityAxis} : Alcoa Aluminio [Member]
1/1/2006 - 12/31/2006
</KeyName><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2006_To_12_31_2006_dei_LegalEntityAxis_aa_AlcoaAluminioMember_us-gaap_StatementGeographicalAxis_aa_EstreitoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2006-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2006-12-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Estreito Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_EstreitoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Alcoa Aluminio [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_AlcoaAluminioMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit1</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>pure</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Id="1" Label="12 Months Ended" /><Label Id="2" Label="Dec. 31, 2006" /><Label Id="3" Label="Estreito Project [Member]" /><Label Id="4" Label="Alcoa Aluminio [Member]" /></Labels></Column><Column><Id>20</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
5/1/2009 - 5/31/2009
USD ($)
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Duration_5_1_2009_To_5_31_2009_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2009-05-01T00:00:00</PeriodStartDate><PeriodEndDate>2009-05-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit12</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="1 Months Ended" /><Label Id="2" Label="May 31, 2009" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="USD ($)" /></Labels></Column><Column><Id>21</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>BRL</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
5/1/2009 - 5/31/2009
BRL
</KeyName><CurrencySymbol /><contextRef><ContextID>Duration_5_1_2009_To_5_31_2009_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2009-05-01T00:00:00</PeriodStartDate><PeriodEndDate>2009-05-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit13</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>BRL</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>BRL</CurrencyCode><OriginalCurrencyCode>BRL</OriginalCurrencyCode></MCU><CurrencySymbol /><Labels><Label Id="1" Label="1 Months Ended" /><Label Id="2" Label="May 31, 2009" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="BRL" /></Labels></Column><Column><Id>22</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
1/1/2011 - 3/31/2011
USD ($)
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Duration_1_1_2011_To_3_31_2011_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2011-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2011-03-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit12</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2011" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="USD ($)" /></Labels></Column><Column><Id>23</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>BRL</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
1/1/2011 - 3/31/2011
BRL
</KeyName><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2011_To_3_31_2011_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2011-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2011-03-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit13</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>BRL</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>BRL</CurrencyCode><OriginalCurrencyCode>BRL</OriginalCurrencyCode></MCU><CurrencySymbol /><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2011" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="BRL" /></Labels></Column><Column><Id>24</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
1/1/2009 - 3/31/2009
USD ($)
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Duration_1_1_2009_To_3_31_2009_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2009-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2009-03-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit12</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2009" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="USD ($)" /></Labels></Column><Column><Id>25</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>BRL</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
1/1/2009 - 3/31/2009
BRL
</KeyName><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2009_To_3_31_2009_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2009-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2009-03-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit13</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>BRL</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>BRL</CurrencyCode><OriginalCurrencyCode>BRL</OriginalCurrencyCode></MCU><CurrencySymbol /><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2009" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="BRL" /></Labels></Column><Column><Id>26</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
1/1/2010 - 12/31/2010
USD ($)
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Duration_1_1_2010_To_12_31_2010_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2010-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2010-12-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit12</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="12 Months Ended" /><Label Id="2" Label="Dec. 31, 2010" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="USD ($)" /></Labels></Column><Column><Id>27</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>BRL</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
1/1/2010 - 12/31/2010
BRL
</KeyName><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2010_To_12_31_2010_us-gaap_StatementGeographicalAxis_aa_SerraDoFacaoProjectMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000004281</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2010-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2010-12-31T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Serra do Facao Project [Member]</ValueName><ValueType>us-gaap_StatementGeographicalAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>aa_SerraDoFacaoProjectMember</Id><dimensionId>us-gaap_StatementGeographicalAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit13</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>BRL</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>BRL</CurrencyCode><OriginalCurrencyCode>BRL</OriginalCurrencyCode></MCU><CurrencySymbol /><Labels><Label Id="1" Label="12 Months Ended" /><Label Id="2" Label="Dec. 31, 2010" /><Label Id="3" Label="Serra do Facao Project [Member]" /><Label Id="4" Label="BRL" /></Labels></Column><Column><Id>28</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode /><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_StatementGeographicalAxis} : Serra do Facao Project [Member]
{dei_LegalEntityAxis} : Alcoa Aluminio [Member]
1/1/2006 - 12/31/2006
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1/1/2011 - 3/31/2011
USD ($)
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1/1/2011 - 3/31/2011
AUD (&amp;#x24;)
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1/1/2004 - 12/31/2004
USD ($)
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1/1/2004 - 12/31/2004
AUD (&amp;#x24;)
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12/31/2011
USD ($)
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1/1/2006 - 12/31/2006
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3/31/2011
USD ($)
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3/31/2011
BRL
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3/31/2011
USD ($)
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guarantor's obligations under the guarantee or each group of similar guarantees.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 5
 -Paragraph 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name FASB Interpretation (FIN)
 -Number 45
 -Paragraph 13
 -Subparagraph c

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(Consider the frequency of payment.)</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 22
 -Article 5

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the required periodic payments applied to interest. (Consider the frequency of payment.)</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 22
 -Article 5

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/><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>38</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Total change in each class of partners' capital accounts during the year due to the return of partner's capital. That is, excess distributions over earnings to partners. All partners include general, limited and preferred partners.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 04
 -Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
 -Number 87-21

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
 -Number 14
 -Paragraph 15

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of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents commitments outstanding as of the balance sheet date which obligate or represent potential claims against the assets of the Company relating to, for example, the extension of credit. Further, commitments generally represent off balance sheet arrangements that obligate the entity to deliver assets or services or enter into another obligation in the future.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 25
 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 03
 -Paragraph 17
 -Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 03
 -Paragraph 19
 -Article 7

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contingency.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
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 -Name FASB Interpretation (FIN)
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 -Paragraph 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 5
 -Paragraph 9, 10, 11, 12

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 159
 -Paragraph 18
 -Subparagraph f

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Principles Board Opinion (APB)
 -Number 18
 -Paragraph 20
 -Subparagraph a (1)

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