Background (Details) (USD $)												3 Months Ended
	Sep. 30, 2012	Dec. 31, 2011 Navigation Solutions LLC	Aug. 26, 2012 Dollar Thrifty Automotive Group Inc [Member]	Sep. 30, 2012 European Securitization		Dec. 31, 2011 European Securitization		Sep. 30, 2012 European Securitization Dollar Thrifty Automotive Group Inc [Member]	Sep. 30, 2012 Senior credit facility	Sep. 30, 2012 Senior credit facility Dollar Thrifty Automotive Group Inc [Member]	Sep. 30, 2012 Convertible Notes Payable [Member] Dollar Thrifty Automotive Group Inc [Member]	Sep. 30, 2012 Adreca Holdings Corp [Member] Minimum	Sep. 30, 2012 Adreca Holdings Corp [Member] Maximum
Background Disclosure [Abstract]
Percentage of Hertz outstanding capital stock owned by Hertz Investors, Inc.	100.00%
Percentage of Hertz Investors, Inc.'s capital stock owned by Hertz Global Holdings, Inc.	100.00%
Common stock of Hertz Holdings owned by the Sponsors (as a percent)	38.00%
Acquisition
Ownership interest immediately prior to acquisition (as a percent)		65.00%
Percentage of equity interest acquired		100.00%
Business Acquisition, Share Price			$ 87.50
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 2,300,000,000
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents			400,000,000
Business Acquisition, Cost of Acquired Entity, Cash Paid			345,000,000
Outstanding principal				413,600,000	[1]	256,200,000	[1]	1,950,000,000			1,200,000,000
Outstanding standby letters of credit									553,300,000	750,000,000
Business Combination, Separately Recognized Transactions, Net Gains and Losses												$ 30,000,000	$ 35,000,000

[1] Maturity reference is to the "expected final maturity date" as opposed to the subsequent "legal maturity date." The expected final maturity date is the date by which Hertz and investors in the relevant indebtedness expect the relevant indebtedness to be repaid. The legal final maturity date is the date on which the relevant indebtedness is legally due and payable.