Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Other Intangible Asset Balances

The following table presents goodwill and other intangible asset balances and adjustments to those balances for the years ended December 31, 2024 and 2023. The goodwill balance attributed to the Company's trucking operating segment was $159 million, $245 million, and $239 million as of December 2024, 2023 and 2022, respectively. The goodwill balance attributed to the rail segment was $80 million at the end of each of the years shown. All intangible assets are attributed to the trucking operating segment.

	Goodwill		Intangible Assets
(Dollars in Millions)	Net Carrying Amount		Cost		Accumulated Amortization		Net Carrying Amount		Total Goodwill and Other Intangible Assets - Net
Balance at December 31, 2022	$	319	$	198	$	(15)	$	183	$	502
Additions	6		8		—		8		14
Amortization	—		—		(10)		(10)		(10)
Balance at December, 31, 2023	$	325	$	206	$	(25)	$	181	$	506
Additions	22		25		—		25		47
Amortization	—		—		(12)		(12)		(12)
Impairment	(108)		—		—		—		(108)
Balance at December, 31, 2024	$	239	$	231	$	(37)	$	194	$	433