Business Combinations - Schedule of Pro Forma Supplementary Data (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
Jun. 02, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Asset Acquisition [Line Items]
Historic/pro forma total revenues		$ 1,219	$ 1,245	$ 2,399	$ 2,438
Historic/combined pretax income (loss)		(82)	139	(98)	258
Impact of fair value adjustments/useful life changes on depreciation		12	19	33	38
Intangible asset amortization		(18)	(30)	(45)	(59)
Interest expense		(41)	(80)	(104)	(163)
Elimination of historic interest		10	20	26	39
Elimination of transaction expenses		112	1	195	(46)
Pro forma pretax income (loss)		(7)	69	7	67
Equipment rental
Asset Acquisition [Line Items]
Historic/pro forma total revenues		1,051	1,096	2,064	2,128
Herc
Asset Acquisition [Line Items]
Historic/pro forma total revenues		1,002	848	1,863	1,652
Historic/combined pretax income (loss)		(46)	93	(54)	174
Herc \| Equipment rental
Asset Acquisition [Line Items]
Historic/pro forma total revenues		870	765	1,609	1,484
Otay
Asset Acquisition [Line Items]
Historic/pro forma total revenues			20		38
Historic/combined pretax income (loss)			1		3
Impact of fair value adjustments/useful life changes on depreciation			1		3
Intangible asset amortization			(3)		(5)
Interest expense			(4)		(9)
Elimination of historic interest			2		3
Elimination of transaction expenses			1		1
Otay \| Equipment rental
Asset Acquisition [Line Items]
Historic/pro forma total revenues			19		36
H&E Equipment Services Inc
Asset Acquisition [Line Items]
Historic/pro forma total revenues	$ 100	217	377	536	748
Historic/combined pretax income (loss)		(36)	45	(44)	81
Impact of fair value adjustments/useful life changes on depreciation		12	18	33	35
Intangible asset amortization		(18)	(27)	(45)	(54)
Interest expense		(41)	(76)	(104)	(154)
Elimination of historic interest		10	18	26	36
Elimination of transaction expenses		112	0	195	(47)
H&E Equipment Services Inc \| Equipment rental
Asset Acquisition [Line Items]
Historic/pro forma total revenues		$ 181	$ 312	$ 455	$ 608

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