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Derivatives And Other Financial Instruments (Fair Value Of Outstanding Derivative Contracts Recorded As Liabilities) (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Fair value liability derivatives | $ 737 |  | $ 865 |
Other Current Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Contracts [Member] |  |  |  |
Fair value liability derivatives | 90 |  | 89 |
Other Current Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Aluminum Contracts [Member] |  |  |  |
Fair value liability derivatives | 43 | [1] | 52 | [1]
Other Current Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy Contract [Member] |  |  |  |
Fair value liability derivatives |  |  | 62 | [1]
Other Current Liabilities [Member] | Aluminum Contracts [Member] |  |  |  |
Fair value liability derivatives | 8 |  | 4 |
Other Current Liabilities [Member] | Energy Contract [Member] |  |  |  |
Fair value liability derivatives |  |  | 37 |
Other Noncurrent Liabilities [Member] |  |  |  |
Fair value liability derivatives | 8 |  | 41 |
Other Noncurrent Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Contracts [Member] |  |  |  |
Fair value liability derivatives | 554 |  | 647 |
Other Noncurrent Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Aluminum Contracts [Member] |  |  |  |
Fair value liability derivatives | 24 | [1] | 33 | [1]
Other Noncurrent Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Embedded Credit Derivative [Member] |  |  |  |
Fair value liability derivatives | 33 | [1] | 23 | [1]
Other Noncurrent Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] |  |  |  |
Fair value liability derivatives | 1 | [1] |  |
Derivatives Designated As Hedging Instruments [Member] |  |  |  |
Fair value liability derivatives | 644 |  | 736 |
Derivatives Not Designated As Hedging Instruments [Member] |  |  |  |
Fair value liability derivatives | $ 101 | [1] | $ 170 | [1]
[1] | See the "Other" section within Note P for additional information on Alcoa's purpose for entering into derivatives not designated as hedging instruments and its overall risk management strategies.

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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant