Derivative Instruments and Hedging Activities - Summary of Gains and Losses on Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), net investment hedge, gain (loss), before reclassification and tax	$ 49	$ 14
Other comprehensive income (loss), cash flow hedge and net investment hedge, gain (loss), before reclassification, tax	(121)	(6)
Other comprehensive income (loss), reclassification adjustment from AOCI, cash flow hedges and net investment hedges, net of tax	(1)	0
Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), net investment hedge, gain (loss), before reclassification and tax	0	0
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax	(184)	(11)
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	0
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax	14	(9)
Foreign exchange contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax	(1)	0
Foreign exchange contracts | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income, undesignated derivative instruments	$ 2	$ (8)