Income taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accrued expenses	$ 209	$ 180
Deferred loss and tax credit carryforwards	207	207
Stock compensation	110	106
Inventories and related reserves	74	105
Retirement costs for defined benefit and retiree health care	0	44
Other	40	3
Total deferred tax assets, before valuation allowance	640	645
Valuation allowance	(188)	(179)
Total deferred tax assets, after valuation allowance	452	466
Deferred tax liabilities:
Property, plant and equipment	(197)	(116)
International earnings	(38)	(44)
Retirement costs for defined benefit and retiree health care	(15)	0
Acquisition-related intangibles and fair-value adjustments	(12)	(40)
Other	(14)	(13)
Total deferred tax liabilities	(276)	(213)
Net deferred tax asset	$ 176	$ 253