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Document And Entity Information
6 Months Ended
Jun. 30, 2011
Jul. 15, 2011
Document And Entity Information    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2011
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q2  
Trading Symbol aa  
Entity Registrant Name ALCOA INC  
Entity Central Index Key 0000004281  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   1,064,183,062