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Financial Instruments - Schedule of Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Carrying Value [Member]    
Derivative [Line Items]    
Cash and cash equivalents $ 1,785 $ 1,863
Restricted cash 5 15
Derivatives - current asset 19 14
Noncurrent receivables 20 21
Derivatives - noncurrent asset 12 10
Available-for-sale securities 104 102
Investment in common stock of Alcoa Corporation   1,020
Short-term borrowings 48 36
Derivatives - current liability 14 5
Long-term debt due within one year   4
Derivatives - noncurrent liability 9 3
Contingent payment related to an acquisition 80 78
Long-term debt, less amount due within one year 6,796 8,044
Fair Value [Member]    
Derivative [Line Items]    
Cash and cash equivalents 1,785 1,863
Restricted cash 5 15
Derivatives - current asset 19 14
Noncurrent receivables 20 21
Derivatives - noncurrent asset 12 10
Available-for-sale securities 104 102
Investment in common stock of Alcoa Corporation   1,020
Short-term borrowings 48 36
Derivatives - current liability 14 5
Long-term debt due within one year   4
Derivatives - noncurrent liability 9 3
Contingent payment related to an acquisition 80 78
Long-term debt, less amount due within one year $ 7,249 $ 8,519