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Segment and Geographic Area Information - Schedule of Segment Reporting Information to Consolidated Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Assets By Segment [Line Items]        
Consolidated assets $ 20,038 $ 36,477    
Cash and cash equivalents 1,863 1,362 $ 1,877 $ 1,437
Corporate goodwill 5,148 5,249 $ 5,087  
Corporate fixed assets, net 5,499 5,425    
LIFO reserve 371 387    
Investment in common stock of Alcoa Corporation 1,020      
Operating Segments [Member]        
Schedule Of Assets By Segment [Line Items]        
Consolidated assets 15,415 15,540    
Other [Member]        
Schedule Of Assets By Segment [Line Items]        
Cash and cash equivalents 1,863 1,362    
Deferred income taxes 1,234 1,308    
Corporate goodwill 331 330    
Corporate fixed assets, net 308 279    
LIFO reserve (371) (387)    
Fair value of derivative contracts 24      
Investment in common stock of Alcoa Corporation 1,020      
Assets of discontinued operations   17,154    
Other $ 214 $ 891