(Borrowing Capacity) (Details) $ in Millions	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Remaining capacity	$ 2,297
Availability under borrowing base limitation	1,043
Senior ABL Facility
Debt Instrument [Line Items]
Remaining capacity	1,142
Availability under borrowing base limitation	1,019
Corporate Debt
Debt Instrument [Line Items]
Remaining capacity	1,142
Availability under borrowing base limitation	1,019
HVF II U.S. Fleet Variable Funding Notes
Debt Instrument [Line Items]
Remaining capacity	481
Availability under borrowing base limitation	0
HFLF Variable Funding Notes
Debt Instrument [Line Items]
Remaining capacity	153
Availability under borrowing base limitation	0
U.S. Fleet Financing Facility
Debt Instrument [Line Items]
Remaining capacity	26
Availability under borrowing base limitation	19
European Securitization
Debt Instrument [Line Items]
Remaining capacity	214
Availability under borrowing base limitation	2
Canadian Securitization
Debt Instrument [Line Items]
Remaining capacity	58
Availability under borrowing base limitation	0
Dollar Thrifty Sponsored Canadian Securitization
Debt Instrument [Line Items]
Remaining capacity	89
Availability under borrowing base limitation	0
Australian Securitization
Debt Instrument [Line Items]
Remaining capacity	92
Availability under borrowing base limitation	0
Capitalized Leases
Debt Instrument [Line Items]
Remaining capacity	42
Availability under borrowing base limitation	3
Fleet Debt
Debt Instrument [Line Items]
Remaining capacity	1,155
Availability under borrowing base limitation	$ 24

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_SeniorAssetsBasedLineOfCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_HVFIIUSFleetVariableFundingNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_HFLFVariableFundingNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_UsFleetFinancingFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_EuropeanSecuritizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_CanadianSecuritizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_DollarThriftySponsoredCanadianSecuritizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_AustralianSecuritizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_CapitalLeaseObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=htz_FleetDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: