Acquisitions (Narrative) (Details) rental_unit in Thousands, $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	May 25, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) rental_unit
Business Acquisition [Line Items]
Revenues		$ 2,287	$ 1,939	$ 4,344	$ 4,064
Pretax income		377	251	652	477
General Finance Corporation
Business Acquisition [Line Items]
Revenues		41		41
Aggregate consideration paid	$ 1,032
Pretax income		7		7
General Finance Corporation
Business Acquisition [Line Items]
Rental fleet, number of units (approximately) | rental_unit							100
Property subject to or available for operating lease, gross							$ 650
Revenues		$ 55	$ 84	$ 144	$ 173	$ 342