Financial Instruments - Economic Hedges (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	$ (244)	$ 80
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	(73)	61
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	1	0
Currency exchange contracts | Forecasted transactions | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	26	5
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	(1)	0
Commodity contracts | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives instruments, pre-tax gains/(losses) recognized in earnings	$ (197)	$ 14