Restructuring income/costs - Restructuring and related costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 359	$ 780	$ 299
Employee separation
Restructuring Cost and Reserve [Line Items]
Restructuring costs	64	74	77
Divestitures
Restructuring Cost and Reserve [Line Items]
Restructuring costs	164	586	0
Contract termination
Restructuring Cost and Reserve [Line Items]
Restructuring costs	7	7	1
Long-lived asset impairments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	6	3	6
Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 118	$ 110	$ 215