Equipment held for lease - Summary of fixed and variable operating lease revenues (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Leases Lease Income [Abstract]
Fixed lease revenue	$ 1,502	$ 1,344	$ 4,397	$ 3,796
Variable lease revenue	602	615	1,830	1,722
Total	$ 2,104	$ 1,959	$ 6,227	$ 5,518