Revenues - Accounts Receivables, Net (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
---|---|---|
Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
Total Accounts Receivable, net | $ 1,148 | $ 912 |
Freight Receivables | ||
Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
Accounts Receivables, gross | 951 | 716 |
Allowance for Credit Losses | (14) | (16) |
Total Accounts Receivable, net | 937 | 700 |
Non-Freight Receivables | ||
Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
Accounts Receivables, gross | 225 | 224 |
Allowance for Credit Losses | (14) | (12) |
Total Accounts Receivable, net | $ 211 | $ 212 |