Economic Hedges (Detail) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (Loss) Recognized in Earnings	$ 97	$ (29)	$ 144	$ (551)		$ 436	$ 628
Economic Hedging | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (Loss) Recognized in Earnings					$ (138)	443	503
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Commodity contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (Loss) Recognized in Earnings					(101)	(38)	(136)
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Intercompany loans and forecasted interest payments | Currency exchange contracts | Interest and other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (Loss) Recognized in Earnings					21	29	4
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Forecasted transactions | Currency exchange contracts | Interest and other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (Loss) Recognized in Earnings					11	435	610
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Forecasted transactions | Currency exchange contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (Loss) Recognized in Earnings					(76)	29	29
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Forecasted transactions | Currency exchange contracts | Selling, general and administrative expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (Loss) Recognized in Earnings					$ 7	$ (12)	$ (4)