Revenue Earning Equipment (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Summary of revenue earning equipment
Cost	$ 9,473,236,000	$ 9,473,236,000	$ 9,269,518,000
Accumulated Depreciation	(3,485,433,000)	(3,485,433,000)	(3,514,910,000)
Net Book Value	5,987,803,000	5,987,803,000	5,754,608,000
Effect of change in estimated residual values of revenue earning equipment on pre tax earnings	7,400,000	14,900,000
Held for use: Full service lease [Member]
Summary of revenue earning equipment
Cost	6,826,293,000	6,826,293,000	6,728,746,000
Accumulated Depreciation	(2,433,139,000)	(2,433,139,000)	(2,500,786,000)
Net Book Value	4,393,154,000	4,393,154,000	4,227,960,000
Held for use: Commercial rental [Member]
Summary of revenue earning equipment
Cost	2,128,962,000	2,128,962,000	2,041,698,000
Accumulated Depreciation	(686,786,000)	(686,786,000)	(660,356,000)
Net Book Value	1,442,176,000	1,442,176,000	1,381,342,000
Held-for-sale [Member]
Summary of revenue earning equipment
Cost	517,981,000	517,981,000	499,074,000
Accumulated Depreciation	(365,508,000)	(365,508,000)	(353,768,000)
Net Book Value	$ 152,473,000	$ 152,473,000	$ 145,306,000