Other assets impairments, restructuring and other items - Components of costs associated with restructuring plan including costs related to exit and disposal activities (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 27	$ 25	$ 93	$ 117
Employee termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	16	32	40	95
Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12	$ (7)	$ 53	$ 22