Derivatives and Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Carrying Value [Member]
Derivative [Line Items]
Cash and cash equivalents	$ 3,272	$ 1,437
Restricted cash	18	18
Noncurrent receivables	18	19
Available-for-sale securities	144	119
Short-term borrowings	57	57
Commercial paper	99
Long-term debt due within one year	35	655
Long-term debt, less amount due within one year	8,797	7,607
Fair Value [Member]
Derivative [Line Items]
Cash and cash equivalents	3,272	1,437
Restricted cash	18	18
Noncurrent receivables	18	19
Available-for-sale securities	144	119
Short-term borrowings	57	57
Commercial paper	99
Long-term debt due within one year	35	1,040
Long-term debt, less amount due within one year	$ 9,335	$ 7,863