Location on the Balance Sheet of Derivative Assets and Liabilities (Detail) - Fair Value, Inputs, Level 2 - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Asset Derivatives
Asset Derivatives	$ 733	$ 432
Net Amounts if Right of Offset had been Applied	726	407
Derivative Liabilities [Abstract]
Liability Derivatives	25	37
Net Amounts if Right of Offset had been Applied	18	12
Designated as Hedging Instrument | Foreign exchange contracts | Other current assets
Asset Derivatives
Asset Derivatives	230	138
Net Amounts if Right of Offset had been Applied	229	131
Designated as Hedging Instrument | Foreign exchange contracts | Other non-current assets
Asset Derivatives
Asset Derivatives	427	252
Net Amounts if Right of Offset had been Applied	426	236
Designated as Hedging Instrument | Foreign exchange contracts | Other current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	1	7
Net Amounts if Right of Offset had been Applied	0	0
Designated as Hedging Instrument | Foreign exchange contracts | Other non-current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	1	16
Net Amounts if Right of Offset had been Applied	0	0
Designated as Hedging Instrument | Interest rate contracts | Other current assets
Asset Derivatives
Asset Derivatives	24	2
Net Amounts if Right of Offset had been Applied	24	2
Designated as Hedging Instrument | Interest rate contracts | Other non-current assets
Asset Derivatives
Asset Derivatives	34	21
Net Amounts if Right of Offset had been Applied	31	20
Designated as Hedging Instrument | Interest rate contracts | Other non-current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	15	11
Net Amounts if Right of Offset had been Applied	12	10
Not Designated as Hedging Instrument | Foreign exchange contracts | Other current assets
Asset Derivatives
Asset Derivatives	3	7
Net Amounts if Right of Offset had been Applied	3	7
Not Designated as Hedging Instrument | Interest rate contracts | Other current assets
Asset Derivatives
Asset Derivatives	15	0
Net Amounts if Right of Offset had been Applied	13	0
Not Designated as Hedging Instrument | Interest rate contracts | Other non-current assets
Asset Derivatives
Asset Derivatives	0	12
Net Amounts if Right of Offset had been Applied	0	11
Not Designated as Hedging Instrument | Interest rate contracts | Other current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	8	0
Net Amounts if Right of Offset had been Applied	6	0
Not Designated as Hedging Instrument | Interest rate contracts | Other non-current liabilities
Derivative Liabilities [Abstract]
Liability Derivatives	0	3
Net Amounts if Right of Offset had been Applied	$ 0	$ 2