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Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended |
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Aug. 31, 2012 | Jun. 01, 2012 | Sep. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Jan. 31, 2012 Aluminio [Member] Day | Sep. 30, 2012 Aluminio [Member] Day | Sep. 30, 2012 Aluminio [Member] Day | Sep. 30, 2012 Two Term Loan Agreements [Member] | Jan. 31, 2012 Two Term Loan Agreements [Member] | Sep. 30, 2012 First Loan Agreement [Member] | Jun. 30, 2012 First Loan Agreement [Member] | Sep. 30, 2012 Third Loan Agreement [Member] | Sep. 30, 2012 Revolving Credit Agreement [Member] Year | Feb. 29, 2012 Revolving Credit Agreement [Member] | Jan. 31, 2012 Revolving Credit Agreement [Member] | Sep. 30, 2012 Revolving Credit Agreement [Member] Two Term Loan Agreements [Member] | Sep. 30, 2012 Revolving Credit Agreement [Member] First Loan Agreement [Member] | Sep. 30, 2012 Revolving Credit Agreement [Member] Fourth Loan Agreement [Member] | Sep. 30, 2012 Revolving Credit Agreement [Member] Third Loan Agreement [Member] | Sep. 30, 2012 Revolving Credit Agreement [Member] Second Loan Agreement [Member] | Aug. 31, 2012 Bond Series 2012 [Member] | Sep. 30, 2012 Current Asset [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding debt |  | $ 322 |  | $ 793 | $ 1,122 |  | $ 5 | $ 280 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt, interest rate |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility Amount Outstanding |  |  |  |  |  | 280 |  |  |  | 350 | 100 | 150 | 150 |  | 100 | 100 |  |  | 100 |  |  |  |
Pension Contributions |  |  | 163 | 515 | 217 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable Margin On LIBOR |  |  |  |  |  |  |  |  | 1.50% |  | 1.25% |  | 1.375% |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  | Dec. 31, 2012 |  |  |  |  |  |  |  | Jul. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 |  |
Revolving credit facility, term |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 2.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average maturity days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of bond | 250 |  |  | 886 | 1,254 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instruments maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2042 |
Net proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 248 |
Restricted cash |  |  | $ 212 | $ 212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 198
Loan agreement to redeem the Bonds, descriptions |  |  |  | Alcoa has the option through the loan agreement to redeem the Bonds, as a whole or in part, on or after August 1, 2022, on at least 30 days, but not more than 60 days, prior notice to the holders of the Bonds at a redemption price equal to 100% of the principal amount thereof, without premium, plus accrued interest, if any, to the redemption date. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of days prior notice to redeem bonds |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of days prior notice to redeem bonds |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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