Debt - Schedule of Facilities Available Net of Outstanding Letters of Credit (Details) $ in Millions	Sep. 30, 2026 USD ($)
Debt Instrument [Line Items]
Remaining Capacity	$ 3,614
Availability Under Borrowing Base Limitation	415
Non-Vehicle Debt
Debt Instrument [Line Items]
Remaining Capacity	415
Availability Under Borrowing Base Limitation	415
First Lien RCF
Debt Instrument [Line Items]
Remaining Capacity	415
Availability Under Borrowing Base Limitation	415
Vehicle Debt
Debt Instrument [Line Items]
Remaining Capacity	3,199
Availability Under Borrowing Base Limitation	0
HVF III Series 2021-A
Debt Instrument [Line Items]
Remaining Capacity	2,363
Availability Under Borrowing Base Limitation	0
European ABS
Debt Instrument [Line Items]
Remaining Capacity	570
Availability Under Borrowing Base Limitation	0
Hertz Canadian Securitization
Debt Instrument [Line Items]
Remaining Capacity	35
Availability Under Borrowing Base Limitation	0
Australian Securitization
Debt Instrument [Line Items]
Remaining Capacity	45
Availability Under Borrowing Base Limitation	0
New Zealand RCF
Debt Instrument [Line Items]
Remaining Capacity	23
Availability Under Borrowing Base Limitation	0
U.K. ABS
Debt Instrument [Line Items]
Remaining Capacity	148
Availability Under Borrowing Base Limitation	0
Other Vehicle Debt
Debt Instrument [Line Items]
Remaining Capacity	15
Availability Under Borrowing Base Limitation	$ 0