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Component: (Network and Table)
Network
1109 - Disclosure - Income Taxes - Components of Loss from Continuing Operations Before Income Taxes (Detail)
(http://www.alcoa.com/taxonomy/role/DisclosureIncomeTaxesComponentsOfLossFromContinuingOperationsBeforeIncomeTaxes)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001675149 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
United States
(688,000,000) 
(1,053,000,000) 
(709,000,000) 
Foreign
526,000,000  
716,000,000  
646,000,000  
Loss before income taxes
(162,000,000) 
 
(337,000,000) 
 
(63,000,000)