Equipment held for lease - Summary of fixed and variable operating lease revenues (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Leases Lease Income [Abstract]
Fixed lease revenue	$ 1,478	$ 1,264	$ 2,895	$ 2,452
Variable lease revenue	601	623	1,228	1,107
Total	$ 2,079	$ 1,887	$ 4,123	$ 3,559