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Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges $ 66 $ 209 $ 460 $ 780
Operating Segments [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 57 207 422 746
Corporate [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 9 2 38 34
Alumina [Member] | Operating Segments [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 38 1 55 8
Primary Metals [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges     80  
Primary Metals [Member] | Operating Segments [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 11 193 209 608
Global Rolled Products [Member] | Operating Segments [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges (17) $ 13 119 126
Engineered Products and Solutions [Member] | Operating Segments [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 22   33 1
Transportation and Construction Solutions [Member] | Operating Segments [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges $ 3   $ 6 $ 3