Revenues - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accounts Receivable - Net	$ 1,430	$ 1,393
Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	1,069	1,047
Allowance for credit losses	(17)	(18)
Total Accounts Receivable - Net	1,052	1,029
Non-Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	392	378
Allowance for credit losses	(14)	(14)
Total Accounts Receivable - Net	$ 378	$ 364