Location on the Balance Sheet of Derivative Assets and Liabilities (Detail) - Fair Value, Inputs, Level 2 - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Asset Derivatives
Asset Derivatives	$ 202	$ 487
Derivative Asset, Fair Value, Net	173	462
Derivative Liabilities [Abstract]
Liability Derivatives	118	45
Derivative Liability, Fair Value, Amount Offset Against Collateral	89	20
Designated as Hedging Instrument | Foreign Exchange Contracts | Other current assets
Asset Derivatives
Asset Derivatives	46	176
Derivative Asset, Fair Value, Net	38	176
Designated as Hedging Instrument | Foreign Exchange Contracts | Other noncurrent assets
Asset Derivatives
Asset Derivatives	6	131
Derivative Asset, Fair Value, Net	1	126
Designated as Hedging Instrument | Foreign Exchange Contracts | Other current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	18	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	11	0
Designated as Hedging Instrument | Foreign Exchange Contracts | Other non-current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	74	6
Derivative Liability, Fair Value, Amount Offset Against Collateral	68	1
Designated as Hedging Instrument | Interest Rate Contracts | Other current assets
Asset Derivatives
Asset Derivatives	7	0
Derivative Asset, Fair Value, Net	7	0
Designated as Hedging Instrument | Interest Rate Contracts | Other noncurrent assets
Asset Derivatives
Asset Derivatives	103	137
Derivative Asset, Fair Value, Net	89	119
Designated as Hedging Instrument | Interest Rate Contracts | Other current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	(1)	(1)
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	1
Designated as Hedging Instrument | Interest Rate Contracts | Other non-current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	17	21
Derivative Liability, Fair Value, Amount Offset Against Collateral	4	3
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Other current assets
Asset Derivatives
Asset Derivatives	2	1
Derivative Asset, Fair Value, Net	2	1
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Other current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Not Designated as Hedging Instrument | Price Risk Derivative [Member] | Other current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	1	10
Derivative Liability, Fair Value, Amount Offset Against Collateral	1	10
Not Designated as Hedging Instrument | Interest Rate Contracts | Other noncurrent assets
Asset Derivatives
Asset Derivatives	38	42
Derivative Asset, Fair Value, Net	36	40
Not Designated as Hedging Instrument | Interest Rate Contracts | Other non-current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	7	7
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 5	$ 5