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Contingencies and Commitments - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 1 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended |
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Nov. 28, 2011 | Jun. 30, 2009 | Jun. 30, 2013 USD ($) Kmt | Jun. 30, 2012 USD ($) | Jun. 30, 2013 USD ($) Kmt | Jun. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) Installment | Dec. 31, 2012 EUR (€) | Mar. 31, 2013 USD ($) | Mar. 31, 2013 EUR (€) | Nov. 30, 2006 Curtis v. Alcoa Inc. [Member] Person | Jun. 30, 2013 Minimum [Member] USD ($) | Jun. 30, 2013 Maximum [Member] USD ($) | Jun. 30, 2013 Maximum [Member] EUR (€) | Feb. 21, 2013 Alcoa Trasformazioni [Member] USD ($) | Feb. 21, 2013 Alcoa Trasformazioni [Member] EUR (€) | Jun. 30, 2013 Alcoa [Member] USD ($) | Jun. 30, 2013 Alcoa [Member] EUR (€) | Jun. 30, 2013 Alumina [Member] | Jun. 30, 2013 Aluminium Bahrain [Member] USD ($) | Oct. 09, 2012 Alba [Member] USD ($) | Feb. 27, 2008 Alba [Member] | Jun. 30, 2013 Alba [Member] | Sep. 30, 2012 Alba [Member] USD ($) | Jun. 30, 2012 Alba [Member] USD ($) | Jun. 30, 2013 Alba [Member] USD ($) | Jun. 30, 2013 Alba [Member] Minimum [Member] USD ($) | Jun. 30, 2013 Alba [Member] Maximum [Member] USD ($) | Jul. 31, 2006 Italian Government [Member] | Nov. 19, 2009 Italian Government [Member] USD ($) | Nov. 19, 2009 Italian Government [Member] EUR (€)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of alleged conspiracy, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Damages claimed, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Number of days required to dismiss lawsuit | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for suit settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103 |  |  |  | 40 | 45 |  |  |  |  |  |
Restructuring and other charges |  |  | 244 | 15 | 251 | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  | 103 |  |  |  |  | 45 |  |  |  |  |  |
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 170 | 10 | 175 | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  | 62 |  |  |  | 15 | 18 |  |  |  |  |  |
Estimated additional reasonably possible charge |  |  |  |  |  |  | 395 | 303 |  |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  | 75 |  |  |  |  |  |
Contingency settlement agreement amount, total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85 |  |  |  |  |  |  |  |  |  |
Contingency settlement agreement amount paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.5 |  |  |  |  |  |  |  |  |  |
Contingency settlement agreement amount payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.5 |  |  |  |  |  |  |  |  |  |
Contingency settlement agreement future payable date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | October 9, 2013 |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |
Estimated contingency settlement changes, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 | 30 |  |  |
Estimated additional reasonably possible charge, minimum |  |  |  |  |  |  | 207 | 159 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Amount of settlement offer rejected |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charges recorded of settlement amount |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of allocated Cost of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% | 85.00% | 15.00% |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for suit settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |
Retired former employees involved in class action |  |  |  |  |  |  |  |  |  |  | 13,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trial length, number of days |  | 8 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management estimate for maximum exposure from class action |  |  |  |  |  |  |  |  | 110 | 85 |  |  |  |  | 97 | 76 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for contract losses |  |  |  |  |  |  |  |  |  |  |  | 0 | 97 | 76 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years operating under a power supply structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Charge related to European Commission announcement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 | 173
Write-off of receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 | 14
Establishment reserve |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 230 | 159
Recovery amount |  |  |  |  |  |  | 375 | 303 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in recovery amount |  |  |  |  |  |  | 65 | 53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Italian Government |  |  |  |  |  |  | 310 | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Italian Government, installments amount |  |  |  |  |  |  | 65 | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments, litigation payment |  |  |  |  |  |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation reserve |  |  |  |  |  |  | $ 207 | € 159 |  |  |  |  |  |  |  |  | $ 11 | € 9 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of curtailment, in kmt-per-year |  |  | 44 |  | 44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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