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Derivatives and Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Carrying Value[Member]    
Derivative [Line Items]    
Cash and cash equivalents $ 1,739 $ 1,877
Restricted cash 24 20
Noncurrent receivables 17 17
Available-for-sale securities 177 153
Short-term borrowings 50 54
Commercial paper 0 0
Long-term debt due within one year 136 29
Long-term debt, less amount due within one year 9,091 8,769
Fair Value [Member]    
Derivative [Line Items]    
Cash and cash equivalents 1,739 1,877
Restricted cash 24 20
Noncurrent receivables 17 17
Available-for-sale securities 177 153
Short-term borrowings 50 54
Commercial paper 0 0
Long-term debt due within one year 136 29
Long-term debt, less amount due within one year $ 9,062 $ 9,445