Acquisitions (Pro Forma Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 2,287	$ 1,939	$ 4,344	$ 4,064
Pro forma revenues	2,342	2,023	4,488	4,237
General Finance Corporation
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 55	$ 84	$ 144	$ 173	$ 342