Revenues - Accounts Receivables, Net (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accounts Receivable, net	$ 1,393	$ 1,313
Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivables, gross	1,047	1,067
Allowance for Credit Losses	(18)	(16)
Total Accounts Receivable, net	1,029	1,051
Non-Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivables, gross	378	279
Allowance for Credit Losses	(14)	(17)
Total Accounts Receivable, net	$ 364	$ 262