Revenues - Accounts Receivables, Net (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accounts Receivable, net	$ 1,313	$ 1,148
Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivables, gross	1,067	951
Allowance for Credit Losses	(16)	(14)
Total Accounts Receivable, net	1,051	937
Non-Freight Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivables, gross	279	225
Allowance for Credit Losses	(17)	(14)
Total Accounts Receivable, net	$ 262	$ 211