Derivative Instruments and Hedging Activities - Summary of Gains and Losses on Hedging Instruments (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), net investment hedge, gain (loss), before reclassification and tax	$ 96
Other comprehensive income (loss), unrealized gain (loss) on derivatives Arising during Period, net investment hedge, before tax		$ 5
Other comprehensive income (loss), cash flow hedge and net investment hedge, gain (loss), before reclassification, tax	43	8	$ (13)	$ 23
Other comprehensive income (loss), reclassification adjustment from AOCI, cash flow hedges and net investment hedges, net of tax	2		3
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax		(1)		(11)
Gain (loss) recognized in income, fair value hedges				4
Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), net investment hedge, gain (loss), before reclassification and tax	0		0
Other comprehensive income (loss), unrealized gain (loss) on derivatives Arising during Period, net investment hedge, before tax		0		0
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax	(57)
Other comprehensive income (loss), unrealized gain (loss) on derivatives Arising during period, before tax		0
Gain (loss) recognized in income, fair value hedges			0	(4)
Interest rate contracts | Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax	0
Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion, net		0
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax	4
Other comprehensive income (loss), unrealized gain (loss) on derivatives Arising during period, before tax		3
Foreign exchange contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax	2
Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion, net		(1)
Foreign exchange contracts | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income, undesignated derivative instruments	$ (4)	9	(16)	3
Cash Flow Hedges | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax			(91)
Other comprehensive income (loss), unrealized gain (loss) on derivatives Arising during period, before tax				0
Cash Flow Hedges | Interest rate contracts | Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax		0
Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion, net			0
Cash Flow Hedges | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax			4
Other comprehensive income (loss), unrealized gain (loss) on derivatives Arising during period, before tax				1
Cash Flow Hedges | Foreign exchange contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax		$ 3
Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion, net			(11)
Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), net investment hedge, gain (loss), before reclassification and tax			$ 74
Other comprehensive income (loss), unrealized gain (loss) on derivatives Arising during Period, net investment hedge, before tax				$ 22