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Derivatives and Other Financial Instruments - Schedule of Fair Values of Outstanding Derivative Contracts Recorded as Assets (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | $ 688 |  | $ 94 |
Level 1 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 48 |  | 57 |
Level 3 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 615 |  | 12 |
Level 2 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 48 |  | 47 |
Other Noncurrent Assets [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 23 | [1] | 22 | [1]
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 100 |  | 109 |
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expense And Other Current Assets [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 38 |  | 51 |
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expense And Other Current Assets [Member] | Aluminum Contracts [Member] | Level 3 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 6 |  | 5 |
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expense And Other Current Assets [Member] | Interest Rate Contract [Member] | Level 2 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 5 |  | 8 |
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 8 |  | 6 |
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Interest Rate Contract [Member] | Level 2 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 43 |  | 37 |
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Energy Contracts [Member] | Level 3 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives |  |  | 2 |
Derivatives Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 611 | [2] | 7 | [2]
Derivatives Not Designated as Hedging Instrument [Member] | Prepaid Expense And Other Current Assets [Member] | Aluminum Contracts [Member] | Level 3 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 208 | [2] |  |
Derivatives Not Designated as Hedging Instrument [Member] | Prepaid Expense And Other Current Assets [Member] | Aluminum Contracts [Member] | Level 2 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives |  |  | 1 | [2]
Derivatives Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Aluminum Contracts [Member] | Level 3 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 401 | [2] | 5 | [2]
Derivatives Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Foreign Exchange Contract [Member] | Level 1 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 2 | [2] | 1 | [2]
Margin Held [Member] | Prepaid Expense And Other Current Assets [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 4 | [1] | 7 | [1]
Margin Held [Member] | Prepaid Expense And Other Current Assets [Member] | Interest Rate Contract [Member] | Level 2 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | 5 | [1] | 8 | [1]
Margin Held [Member] | Other Noncurrent Assets [Member] | Interest Rate Contract [Member] | Level 2 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value asset derivatives | $ 14 | [1] | $ 7 | [1]
[1] | All margin held is in the form of cash and is valued under a Level 1 technique. The levels that correspond to the margin held in the table above reference the level of the corresponding asset for which it is held. Alcoa elected to net the margin held against the fair value amounts recognized for derivative instruments executed with the same counterparties under master netting arrangements.
[2] | See the "Other" section within Note N 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 asset, 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 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. 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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