Financial Instruments - Economic Hedges (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	$ (7)	$ (29)	$ (251)	$ 51
Currency exchange contracts | Intercompany loans and forecasted interest payments | Interest and other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	(7)	(50)	(80)	11
Currency exchange contracts | Forecasted transactions | Interest and other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	(10)	(1)	(9)	(1)
Currency exchange contracts | Forecasted transactions | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	(4)	(25)	22	(20)
Currency exchange contracts | Forecasted transactions | Selling, general and administrative expenses
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	0	(5)	(1)	(5)
Commodity contracts | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	$ 14	$ 52	$ (183)	$ 66