Other income (expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Investment and interest income	$ 20	$ 21	$ 64	$ 91
Foreign exchange gains (losses)	47	(43)	110	(122)
License fee income	31	27	88	75
Net periodic pension and OPEB income (cost), excluding service cost	111	0	333	270
Gains (losses) on securities	50	9	92	(12)
Miscellaneous income (loss)	(34)	0	64	(37)
Total	225	14	751	265
Other income (expense) [Line Items]
Gain (loss) on remeasurement of pension obligations		(77)	0	55
Foreign Plan
Other income (expense) [Line Items]
Gain (loss) on remeasurement of pension obligations	$ 0	$ (79)	$ 0	$ 55