Revenues - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accounts Receivable - Net	$ 1,409	$ 1,326
Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	1,054	1,012
Allowance for credit losses	(20)	(16)
Total Accounts Receivable - Net	1,034	996
Non-Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	393	343
Allowance for credit losses	(18)	(13)
Total Accounts Receivable - Net	$ 375	$ 330