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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions		2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 01, 2025	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Goodwill [Line Items]
Goodwill		$ 80	$ 80		$ 80		$ 239
Impairment			164	$ 0	164	$ 0
Trucking Operations
Goodwill [Line Items]
Goodwill		0	0		0		159
Impairment			164		164
Trucking Operations | Quality Carriers, Inc.
Goodwill [Line Items]
Impairment		164
Impairment of intangible assets	$ 0
Rail Operations
Goodwill [Line Items]
Goodwill		$ 80	$ 80		$ 80		$ 80

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