Supplemental financial information - Restructuring charges and other (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
		Oct. 31, 2021	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Disclosure Text Block Supplement [Abstract]
Restructuring charges	[1]		$ 0		$ 25		$ (15)
Integration charges	[2]		104		0		0
Gains on sales of assets		$ (50)	(50)	[3]	(1)	[3]	(21)	[3]
Restructuring charges/other			$ 54		$ 24		$ (36)

[1] Includes severance and benefits, accelerated depreciation, changes in estimates and other exit costs.

[2] Includes costs related to our purchase of the Lehi, Utah, manufacturing facility, as well as ongoing costs until production begins in early 2023.

[3] Includes a $50 million gain from the sale of property in October 2021.