Equipment held for lease (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	$ 24,167	$ 23,735
Equipment held for lease, accumulated depreciation	(9,129)	(8,817)
Equipment held for lease, net	15,038	14,918
Railcars [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	9,532	9,448
Aircraft [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	9,439	9,234
Other [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment held for lease, gross	$ 5,196	$ 5,053