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Contingencies and Commitments - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended |  |  | 1 Months Ended |
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Jun. 30, 2009 D | Mar. 31, 2013 USD ($) Kmt | Mar. 31, 2012 USD ($) | Dec. 31, 2012 USD ($) Installment | Dec. 31, 2012 EUR (€) | Mar. 31, 2013 EUR (€) | Nov. 08, 2011 D | Nov. 30, 2006 Curtis v. Alcoa Inc. [Member] Person | Mar. 31, 2013 Minimum [Member] USD ($) | Mar. 31, 2013 Maximum [Member] USD ($) | Mar. 31, 2013 Maximum [Member] EUR (€) | Feb. 21, 2013 Alcoa Trasformazioni [Member] USD ($) | Feb. 21, 2013 Alcoa Trasformazioni [Member] EUR (€) | Mar. 31, 2013 Alcoa [Member] USD ($) | Mar. 31, 2013 Alcoa [Member] EUR (€) | Oct. 09, 2012 Alba [Member] USD ($) | Mar. 31, 2013 Alba [Member] USD ($) | Sep. 30, 2012 Alba [Member] USD ($) | Jun. 30, 2012 Alba [Member] USD ($) | Feb. 27, 2008 Alba [Member] Y | Mar. 31, 2013 Alba [Member] Minimum [Member] USD ($) | Mar. 31, 2013 Alba [Member] Maximum [Member] USD ($) | Jul. 31, 2006 Italian Government [Member] Y | Nov. 19, 2009 Italian Government [Member] USD ($) | Nov. 19, 2009 Italian Government [Member] EUR (€)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of alleged conspiracy, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |
Damages claimed, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Number of days required to dismiss lawsuit |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for suit settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 | 45 |  |  |  |  |  |
Restructuring and other charges |  | 7 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45 |  |  |  |  |  |
Restructuring and other charges, after-tax and noncontrolling interests |  | 5 | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 18 |  |  |  |  |  |
Estimated additional reasonably possible charge |  |  |  | 387 | 303 |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |
Retired former employees involved in class action |  |  |  |  |  |  |  | 13,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trial length, number of days | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
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 |  |  |  | 64 | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments, litigation payment |  |  |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation reserve |  |  |  | 203 | 159 |  |  |  |  |  |  |  |  | 75 | 59 |  |  |  |  |  |  |  |  |  |
Range of reasonable possible loss, minimum |  |  |  | $ 203 | € 159 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of curtailment, in kmt-per-year |  | 44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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