Derivatives and Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Carrying Value[Member]
Derivative [Line Items]
Cash and cash equivalents	$ 1,311	$ 1,877
Restricted cash	29	20
Noncurrent receivables	17	17
Available-for-sale securities	157	153
Short-term borrowings	50	54
Commercial paper	0	0
Long-term debt due within one year	26	29
Long-term debt, less amount due within one year	8,713	8,769
Fair Value [Member]
Derivative [Line Items]
Cash and cash equivalents	1,311	1,877
Restricted cash	29	20
Noncurrent receivables	17	17
Available-for-sale securities	157	153
Short-term borrowings	50	54
Commercial paper	0	0
Long-term debt due within one year	26	29
Long-term debt, less amount due within one year	$ 9,215	$ 9,445