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Financial Instruments - Schedule of Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Carrying Value [Member]    
Derivative [Line Items]    
Cash and cash equivalents $ 2,553 $ 1,863
Restricted cash 1 15
Derivatives - current asset 40 14
Noncurrent receivables 21 21
Derivatives - noncurrent asset 24 10
Available-for-sale securities 103 102
Investment in common stock of Alcoa Corporation 446 1,020
Short-term borrowings 47 36
Derivatives - current liability 28 5
Long-term debt due within one year   4
Derivatives - noncurrent liability 11 3
Contingent payment related to an acquisition 79 78
Long-term debt, less amount due within one year 8,046 8,044
Fair Value [Member]    
Derivative [Line Items]    
Cash and cash equivalents 2,553 1,863
Restricted cash 1 15
Derivatives - current asset 40 14
Noncurrent receivables 21 21
Derivatives - noncurrent asset 24 10
Available-for-sale securities 103 102
Investment in common stock of Alcoa Corporation 446 1,020
Short-term borrowings 47 36
Derivatives - current liability 28 5
Long-term debt due within one year   4
Derivatives - noncurrent liability 11 3
Contingent payment related to an acquisition 79 78
Long-term debt, less amount due within one year $ 8,652 $ 8,519