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Investments - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2013 USD ($) Agency Subsidiary | Dec. 31, 2012 USD ($) Kmt | Dec. 31, 2011 USD ($) | Dec. 31, 2013 Becancour Smelter [Member] | Dec. 31, 2013 Boke Investment Company [Member] | Dec. 31, 2013 Compagnie Des Bauxites De Guinee [Member] | Dec. 31, 2013 Alcoa Joint Venture [Member] USD ($) | Dec. 31, 2013 Alcoa Joint Venture [Member] SAR | Dec. 31, 2012 Alcoa Joint Venture [Member] USD ($) | Oct. 31, 2011 Ma'aden Joint Venture [Member] | Dec. 31, 2013 Ma'aden Joint Venture [Member] USD ($) | Dec. 31, 2010 Ma'aden Joint Venture [Member] | Dec. 31, 2012 Smelting and Rolling Mill Companies [Member] USD ($) | Dec. 31, 2010 Smelting and Rolling Mill Companies [Member] USD ($) | Dec. 31, 2013 Other Noncurrent Liabilities and Deferred Credits [Member] USD ($) | Dec. 31, 2012 Other Noncurrent Liabilities and Deferred Credits [Member] USD ($) | Oct. 31, 2011 Refining and Mining Company [Member] USD ($) | Dec. 31, 2013 Refining and Mining Company [Member] USD ($) | Dec. 31, 2012 Refining and Mining Company [Member] USD ($) | Dec. 31, 2013 Fixed Income Securities [Member] USD ($) | Dec. 31, 2012 Equity Securities [Member] USD ($) | Dec. 31, 2011 Scenario One [Member] Saudi Arabia Joint Venture [Member] USD ($) | Dec. 31, 2011 Scenario Two [Member] Saudi Arabia Joint Venture [Member] USD ($) | Dec. 31, 2013 Alcoa World Alumina and Chemicals [Member] Alcoa Joint Venture [Member] | Dec. 31, 2013 Alcoa World Alumina and Chemicals [Member] Alumina Limited [Member] | Dec. 31, 2013 Smelter Sites [Member] Pechiney Reynolds Quebec, Inc. [Member] | Dec. 31, 2012 Smelter Sites [Member] Pechiney Reynolds Quebec, Inc. [Member] | Dec. 31, 2013 Smelter Sites [Member] Becancour Smelter in Quebec, Canada [Member] | Dec. 31, 2013 Smelter Sites [Member] Alcoa [Member] | Dec. 31, 2013 Bauxite Mining [Member] Kmt | Dec. 31, 2013 Bauxite Mining [Member] Halco Mining, Inc. [Member] | Dec. 31, 2012 Bauxite Mining [Member] Halco Mining, Inc. [Member] | Dec. 31, 2013 Bauxite Mining [Member] Minerao Rio Do Norte S.A. [Member] | Dec. 31, 2012 Bauxite Mining [Member] Minerao Rio Do Norte S.A. [Member] | Dec. 31, 2013 Alumina Refinery [Member] Kmt | Dec. 31, 2013 Primary Aluminum Smelter [Member] Kmt | Dec. 31, 2013 Rolling Mill [Member] Kmt
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of equity investments in other entity |  |  |  |  | 49.90% | 100.00% | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% | 40.00% | 50.00% | 50.00% | 50.10% | 25.05% |  | 45.00% | 45.00% | 18.20% | 18.20% |  |  |
Number of wholly-owned subsidiaries |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends from equity investments |  | $ 89 | $ 101 | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture shareholders agreement period, years |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture shareholders agreement, automatic extension additional period, years |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capacity amount of processed bauxite, in kmt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |  |  |  | 1,800 | 740 | 380
Expanded capacity amount of processed bauxite, in Kmt |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  |  |  |  |  |  | 25.10% | 25.10% |  | 74.90% | 74.90% | 74.90% |  | 25.10% |  |  | 25.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial investment |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for pro rata share of pre-incorporation costs |  |  |  |  |  |  |  |  |  |  |  | 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture at fair market value |  |  |  |  |  |  |  |  |  |  |  | 14.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period Bracket To Exercise Option |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period To Open Option Exercise Bracket From Commercial Production Date |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding receivable for labor and other employee-related expenses |  | 31 | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment |  | 1,907 | 1,860 |  |  |  |  | 10,800 | 40,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested by Alcoa and Aluminum Financing Limited |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid-to-date |  | 171 | 253 |  |  |  |  | 832 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | 1,777 | 1,782 |  |  |  |  | 951 |  | 816 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project financing |  |  |  |  |  |  |  |  |  |  |  |  |  | 480 | 4,035 |  |  | 1,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of project financing representing Alcoa interest in venture |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 | 1,013 |  |  | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, principal |  |  |  |  |  |  |  |  |  |  |  |  |  | 121 |  |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, interest maximum |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of guarantee included in other noncurrent liabilities and deferred credits |  | 370 |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of rating agencies to meet commitment on downgrade rating |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined fair value of guarantees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential forfeiture of letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture agreement period | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments |  | $ 130 | $ 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 119 | $ 67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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