Income taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Capitalized R&D	$ 750	$ 380
Accrued expenses	236	182
Deferred loss and tax credit carryforwards	205	201
Stock compensation	163	132
Inventories and related reserves	104	88
Retirement costs for defined benefit and retiree health care	37	43
Other	47	36
Total deferred tax assets, before valuation allowance	1,542	1,062
Valuation allowance	(198)	(189)
Total deferred tax assets, after valuation allowance	1,344	873
Deferred tax liabilities:
Property, plant and equipment	(592)	(410)
International earnings	(33)	(35)
Acquisition-related intangibles and fair-value adjustments	(14)	(13)
Other	(11)	(8)
Total deferred tax liabilities	(650)	(466)
Net deferred tax asset	$ 694	$ 407