Other (Income) Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Component of Other Income / Expense of Nonoperating [Line Items]
Interest income	$ (9)	$ (61)	$ (48)	$ (225)
Interest expense	203	231	624	674
Exchange losses	10	38	89	166
Income from investments in equity securities, net (1)	(360)	(16)	(964)	(50)
Net periodic defined benefit plan (credit) cost other than service cost	(88)	(128)	(259)	(409)
Other, net	(68)	(29)	(72)	206
Other (income) expense, net	$ (312)	$ 35	$ (630)	$ 362