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Noncontrolling Interests - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Noncontrolling Interest [Line Items]        
Charges related to legal matters included in noncontrolling interests       $ 391
Noncontrolling Interests [Member]        
Noncontrolling Interest [Line Items]        
Charges related to legal matters included in noncontrolling interests       17
Aluminum Brazing Sheet [Member]        
Noncontrolling Interest [Line Items]        
Percentage of acquisition of outstanding noncontrolling interest 30.00%      
Alumina Limited [Member]        
Noncontrolling Interest [Line Items]        
Proceeds from noncontrolling shareholder   $ 2 $ 43 $ 9