Revenues - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accounts Receivable - Net	$ 1,348	$ 1,326
Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	1,030	1,012
Allowance for credit losses	(19)	(16)
Total Accounts Receivable - Net	1,011	996
Non-Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	353	343
Allowance for credit losses	(16)	(13)
Total Accounts Receivable - Net	$ 337	$ 330