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Cash Flow Information - Schedule of Cash Paid for Acquisitions Including Non-Controlling Interest (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]      
Assets acquired   $ 2,003 $ 3,515
Liabilities assumed   (868) (345)
Contingent consideration liability     (130)
Equity issued   (870) (610)
Noncontrolling interest acquired     31
Working capital adjustment $ (10)    
Increase in Arconic's shareholders' equity   (60) (3)
Cash paid (10) 205 2,458
Less: cash acquired   302 45
Net cash paid $ (10) $ (97) $ 2,413