Revenues - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accounts Receivable - Net	$ 1,370	$ 1,326
Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	1,024	1,012
Allowance for credit losses	(19)	(16)
Total Accounts Receivable - Net	1,005	996
Non-Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	381	343
Allowance for credit losses	(16)	(13)
Total Accounts Receivable - Net	$ 365	$ 330