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Debt - Schedule of Net Carrying Amount (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025	Jun. 30, 2026
Debt Instrument [Line Items]
Non-cash PIK interest	$ 22	$ 21
Net carrying amount	18,300
The Hertz Corporation
Debt Instrument [Line Items]
Non-cash PIK interest	22	$ 21
Exchangeable Notes Due 2029
Debt Instrument [Line Items]
Unamortized debt discount	(4)		$ (4)
Net carrying amount	294
Exchangeable Notes Due 2029 \| Senior Notes
Debt Instrument [Line Items]
Principal	250		250
Non-cash PIK interest	44		21
Unamortized debt discounts and issuance costs	(10)		(12)
Unamortized debt discount	(61)		(67)
Fair value of the Exchange Features	13		78
Net carrying amount	236		270
Exchangeable Notes Due 2030
Debt Instrument [Line Items]
Net carrying amount	425
Exchangeable Notes Due 2030 \| Senior Notes
Debt Instrument [Line Items]
Principal	425		425
Unamortized debt discounts and issuance costs	(17)		(20)
Unamortized debt discount	(87)		(99)
Fair value of the Exchange Features	11		54
Net carrying amount	332		$ 360
Exchangeable First Lien Notes Due 2030
Debt Instrument [Line Items]
Net carrying amount	380
Exchangeable First Lien Notes Due 2030 \| Senior Notes
Debt Instrument [Line Items]
Principal	380
Unamortized debt discount	(118)			$ (115)
Fair value of the Exchange Features	68
Exchangeable First Lien Notes Due 2030 \| Senior Notes \| The Hertz Corporation
Debt Instrument [Line Items]
Net carrying amount	316
Exchangeable First Lien Notes Due 2030 \| Senior Notes \| Hertz Global
Debt Instrument [Line Items]
Net carrying amount	$ 234