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Debt - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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May 31, 2013 USD ($) | Aug. 31, 2012 | Dec. 31, 2013 USD ($) Agreement LetterOfCredit | Dec. 31, 2013 BRL | Dec. 31, 2012 USD ($) | Dec. 31, 2012 BRL | Dec. 31, 2011 USD ($) | Jan. 31, 2012 | Jul. 25, 2011 USD ($) | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Aluminio [Member] USD ($) | Dec. 31, 2013 Aluminio [Member] BRL | Dec. 31, 2012 Aluminio [Member] USD ($) | Dec. 31, 2013 Alcoa [Member] USD ($) | Dec. 31, 2012 Alcoa [Member] USD ($) | Dec. 31, 2013 Credit Facility [Member] USD ($) | Dec. 31, 2012 Credit Facility [Member] USD ($) | Dec. 31, 2013 Revolving Credit Facility Excluding Commercial Paper [Member] USD ($) | Dec. 31, 2013 Loan Agreement with BNDES [Member] Agreement | Dec. 31, 2012 Loan Agreement with BNDES [Member] | Dec. 31, 2013 Commercial Paper [Member] USD ($) | Dec. 31, 2012 Commercial Paper [Member] USD ($) | Dec. 31, 2011 Commercial Paper [Member] | Dec. 31, 2013 Revolving Credit Agreement [Member] | Dec. 31, 2012 Two term loans agreements [Member] USD ($) | Dec. 31, 2013 First Loans Agreement [Member] Revolving Credit Facility Excluding Commercial Paper [Member] USD ($) | Dec. 31, 2013 Second Loans Agreement [Member] Revolving Credit Facility Excluding Commercial Paper [Member] USD ($) | May 31, 2013 6.00% Notes, Due 2013 [Member] USD ($) | Dec. 31, 2013 6.00% Notes, Due 2013 [Member] | Dec. 31, 2012 6.00% Notes, Due 2013 [Member] USD ($) | May 31, 2013 Debt Accrued and Unpaid Interest [Member] USD ($) | Jan. 31, 2012 6.00% Notes, due 2012 [Member] USD ($) | Aug. 31, 2012 Midwestern Disaster Area Revenue Bonds Series 2012 Due 2042 [Member] USD ($) | Dec. 31, 2013 Three of the Subloans [Member] Loan Agreement with BNDES [Member] USD ($) | Dec. 31, 2013 Three of the Subloans [Member] Loan Agreement with BNDES [Member] BRL | Dec. 31, 2013 Two of the Subloans [Member] Loan Agreement with BNDES [Member] BRL | Dec. 31, 2013 Third Subloan [Member] Loan Agreement with BNDES [Member] BRL | Dec. 31, 2013 BNDES Loans, Due 2014-2029 [Member] USD ($) Agreement | Dec. 31, 2013 BNDES Loans, Due 2014-2029 [Member] BRL Agreement | Dec. 31, 2012 BNDES Loans, Due 2014-2029 [Member] USD ($) | Dec. 31, 2012 BNDES Loans, Due 2014-2029 [Member] BRL | Dec. 31, 2012 BNDES First Loans [Member] USD ($) | Dec. 31, 2012 BNDES First Loans [Member] BRL | Dec. 31, 2013 Revolving Credit Facility [Member] | Dec. 31, 2012 Revolving Credit Agreement [Member] Agreement
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2014 |  |  | $ 658 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2015 |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2016 |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2017 |  |  | 778 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2018 |  |  | 1,046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  | 422 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of bonds |  | 4.75% |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on long-term debt |  |  | 2,317 |  | 1,489 |  | 1,194 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 435 |  |  | 12 |  |  |  |  |  |  |  |  |  |  | 252 | 511 |  |
Purchase premiums repaid recorded as interest expense | 1 |  |  |  |  |  | (30) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 8,262 |  | 8,776 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 422 |  | 322 |  |  |  |  |  | 325 |  | 397 |  |  |  |  |
Debt instruments agreement date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2012 |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing amount |  |  | 1 | 2 | 7 | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 248 |  |  |  |  |  |  |  |  |  |  |  |
Debt instruments maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2042 |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  | 13 |  | 171 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument frequency of periodic payment |  | Semi-annually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption date of bonds |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount repayment |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior debt securities issued under shelf registration statement |  |  | 1,250 |  | 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment on loan agreement |  |  | 85 | 177 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 397 | 687 |  |  |  |  |  |  |  |  |  |
Long-term interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 0.80% | 0.80% | 0.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average margin on long term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.48% | 1.48% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Suloan agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal and interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 667 | 20 |  |  |  |  |  |  |  |
Line of credit facility, outstanding borrowings |  |  |  |  |  |  |  |  | 3,750 |  |  | 52 |  | 280 |  |  | 0 | 0 |  |  |  |  |  |  |  | 350 |  |  |  |  |  |  |  |  |  |  |  |  | 254 | 599 | 311 | 637 |  |  |  |
Weighted-average interest rate |  |  | 6.49% | 6.49% | 6.49% | 6.49% |  |  |  |  |  | 0.72% | 0.72% | 2.32% | 1.57% | 1.89% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of outstanding borrowings |  |  | 22 | 47 | 20 | 38 |  |  |  |  |  | 5 | 11 |  | 1,850 | 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  | 1.55% | 1.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | 71 | 166 | 86 | 177 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of outstanding borrowings |  |  | 6.55% | 6.55% | 6.55% | 6.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined commitment of loan agreements |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 622 |  |  | 1,150 |  |  |  |
Number of other loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |  |  |
Average outstanding commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 242 | 354 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Matures at various times within one year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limit of requested increases in lender commitments |  |  | 500 |  | 990 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit sublimit under credit facility |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | July 25, 2016 |
Extension of maturity period |  |  | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed credit facility amount |  |  | 3,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved credit facility amount |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extended credit facility maturity date |  |  | July 25, 2017 | July 25, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees paid to maintain credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on LIBOR loans |  |  |  |  |  |  |  |  |  | 0.50% | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts borrowed under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 57 |  | 53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable settlement arrangements |  |  | 52 |  | 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of revolving credit facility agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6
Termination of revolving credit agreements |  |  |  |  | (150) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional credit arrangements |  |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan agreement |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit agreement |  |  | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,190 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,850 | 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average maturity days |  |  |  |  |  |  |  |  |  |  |  | 70 days | 70 days | 172 days | 213 days | 260 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit expiration amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,040 | $ 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2014 | Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Applicable margin on LIBOR loans. + References No definition available. + Details
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- Definition Bond redemption date. + References No definition available. + Details
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- Definition Commitment on loan agreement. + References No definition available. + Details
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- Definition Debt instrument agreement date. + References No definition available. + Details
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- Definition Debt instrument maturity date period. + References No definition available. + Details
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- Definition Debt instruments maturity date. + References No definition available. + Details
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- Definition Debt weighted average maturity days. + References No definition available. + Details
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- Definition Interest rate margin. + References No definition available. + Details
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- Definition Letters of credit sublimit under credit facility. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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