Business Combinations - Schedule of Pro Forma Supplementary Data (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Asset Acquisition [Line Items]
Historic/pro forma total revenues	$ 822
Historic/combined pretax income	83
Impact of fair value adjustments/useful life changes on depreciation	2
Intangible asset amortization	(2)
Interest expense	(5)
Elimination of historic interest	1
Elimination of merger related costs	0
Pro forma pretax income	79
Herc
Asset Acquisition [Line Items]
Historic/pro forma total revenues	804
Historic/combined pretax income	81
Otay
Asset Acquisition [Line Items]
Historic/pro forma total revenues	18
Historic/combined pretax income	2
Impact of fair value adjustments/useful life changes on depreciation	2
Intangible asset amortization	(2)
Interest expense	(5)
Elimination of historic interest	1
Elimination of merger related costs	$ 0