Rendering

Component: (Network and Table)
Network
1083 - Disclosure - Inventories - Schedule of Inventory Components (Detail)
(http://www.alcoa.com/taxonomy/role/DisclosureInventoriesScheduleOfInventoryComponents)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000004281 (http://www.sec.gov/CIK)
Inventory Disclosure [Abstract]Period [Axis]
2016-12-31
2015-12-31
Inventory Disclosure [Abstract]
 
 
Finished goods
625,000,000  
672,000,000  
Work-in-process
1,144,000,000  
1,115,000,000  
Purchased raw materials
408,000,000  
425,000,000  
Operating supplies
76,000,000  
72,000,000  
Inventories, total
2,253,000,000  
 
2,284,000,000