Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)			3 Months Ended	12 Months Ended
		Oct. 01, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 01, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 239,000,000	$ 239,000,000	$ 325,000,000	$ 319,000,000
Intangible assets acquired				25,000,000	8,000,000
Impairment	[1],[2]			108,000,000	0	0
Pan-Am
Finite-Lived Intangible Assets [Line Items]
Goodwill							$ 17,000,000
Quality Carriers, Inc.
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				180,000,000
Impairment					0
Quality Carriers, Inc. | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				$ 150,000,000
Amortization period of intangible assets acquired				20 years
Quality Carriers, Inc. | Trade Names
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				$ 30,000,000
Amortization period of intangible assets acquired				15 years
Trucking Operating Segment
Finite-Lived Intangible Assets [Line Items]
Goodwill			159,000,000	$ 159,000,000	245,000,000	239,000,000
Trucking Operating Segment | Quality Carriers, Inc.
Finite-Lived Intangible Assets [Line Items]
Impairment			108,000,000	108,000,000
Impairment of Intangible Assets, Finite-Lived		$ 0
Trucking Operating Segment | Several Acquisitions
Finite-Lived Intangible Assets [Line Items]
Goodwill			22,000,000	22,000,000	6,000,000
Intangible assets acquired				25,000,000	8,000,000
Rail Operations
Finite-Lived Intangible Assets [Line Items]
Goodwill			80,000,000	$ 80,000,000	$ 80,000,000	$ 80,000,000
Impairment			$ 0
Rail Operations | Pan-Am
Finite-Lived Intangible Assets [Line Items]
Goodwill							$ 17,000,000

[1] See Note 20, Revision of Prior Period Financial Statements

[2] See Note 20, Revision of Prior Period Financial Statements.