Derivatives and Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Carrying Value[Member]
Derivative [Line Items]
Cash and cash equivalents	$ 1,919	$ 1,877
Restricted cash	37	20
Noncurrent receivables	17	17
Available-for-sale securities	193	153
Short-term borrowings	38	54
Commercial paper	0	0
Long-term debt due within one year	21	29
Contingent payment related to an acquisition	130	130
Long-term debt, less amount due within one year	9,044	8,769
Fair Value [Member]
Derivative [Line Items]
Cash and cash equivalents	1,919	1,877
Restricted cash	37	20
Noncurrent receivables	17	17
Available-for-sale securities	193	153
Short-term borrowings	38	54
Commercial paper	0	0
Long-term debt due within one year	21	29
Contingent payment related to an acquisition	130	130
Long-term debt, less amount due within one year	$ 8,922	$ 9,445