Revenue Earning Equipment (Depreciation Rate Changes) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenue Earning Equipment [Line Items]
Depreciation rate changes	$ 30	$ 38
U.S. Car Rental
Revenue Earning Equipment [Line Items]
Depreciation rate changes	30	37
International Car Rental
Revenue Earning Equipment [Line Items]
Depreciation rate changes	$ 0	$ 1

Represents the net increase (decrease) in depreciation expenses primarily due to the revision of depreciation rates on a quarterly basis, based on management's routine review of the present and estimated future market conditions and their effect on residual values at the time of disposal.

No definition available.

Name:	htz_IncreaseDecreaseInDepreciationExpense
Namespace Prefix:	htz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration