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Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Carrying Value [Member]    
Derivative [Line Items]    
Cash and cash equivalents $ 1,863 $ 1,362
Restricted cash 15 37
Derivatives - current asset 14 67
Noncurrent receivables 21 17
Derivatives - noncurrent asset 10 31
Available-for-sale securities 102 193
Investment in common stock of Alcoa Corporation 1,020  
Short-term borrowings 36 38
Derivatives - current liability 5 49
Commercial paper 0 0
Long-term debt due within one year 4 3
Derivatives - noncurrent liability 3 19
Contingent payment related to an acquisition 78 130
Long-term debt, less amount due within one year 8,044 8,786
Fair Value [Member]    
Derivative [Line Items]    
Cash and cash equivalents 1,863 1,362
Restricted cash 15 37
Derivatives - current asset 14 67
Noncurrent receivables 21 17
Derivatives - noncurrent asset 10 31
Available-for-sale securities 102 193
Investment in common stock of Alcoa Corporation 1,020  
Short-term borrowings 36 38
Derivatives - current liability 5 49
Commercial paper 0 0
Long-term debt due within one year 4 3
Derivatives - noncurrent liability 3 19
Contingent payment related to an acquisition 78 130
Long-term debt, less amount due within one year $ 8,519 $ 8,714