Equipment held for lease (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	$ 30,024	$ 28,144
Equipment held for lease, accumulated depreciation	(12,196)	(11,197)
Equipment held for lease, net	17,828	16,947
Railcars [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	10,137	10,031
Aircraft [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	14,201	12,537
Other [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	$ 5,686	$ 5,576