Other income (expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Investment and interest income	$ 21	$ 27	$ 44	$ 70
Foreign exchange gains (losses)	(32)	(4)	63	(79)
License fee income	32	23	57	48
Net periodic pension and OPEB income (cost), excluding service cost	111	(63)	222	270
Gains (losses) on securities	17	37	42	(21)
Miscellaneous income (loss)	52	9	98	(37)
Total	201	29	526	251
Other income (expense) [Line Items]
Gain (loss) on remeasurement of pension obligations		(122)	0	132
Foreign Plan
Other income (expense) [Line Items]
Gain (loss) on remeasurement of pension obligations	$ 0	$ (120)	$ 0	$ 134