Supplemental financial information - Other income (expense), net (OI&E) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Text Block Supplement [Abstract]
Other income	[1]	$ 145	$ 327	$ 201
Other expense	[2]	(2)	(14)	(26)
Total		$ 143	$ 313	$ 175

[1] Other income includes royalty and lease income, investment gains and losses, interest income, as well as reversals of tax interest accruals.

[2] Other expense includes a portion of pension and other retiree benefit costs, currency gains and losses and miscellaneous items.