Equipment held for lease (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	$ 28,624	$ 28,144
Equipment held for lease, accumulated depreciation	(11,470)	(11,197)
Equipment held for lease, net	17,154	16,947
Railcars [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	10,073	10,031
Aircraft [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	12,939	12,537
Other [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	$ 5,612	$ 5,576