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Railway Operating Revenues - Schedule of Account Receivables (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenue, payment terms | 15 days |  |
Accounts receivable – net | $ 848 | $ 920 |
Allowance for credit loss, writeoff |  | 32 |
Trade Accounts Receivable |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable – net | 629 | 682 |
Accounts receivable, net, noncurrent | 23 | 23 |
Other Receivables |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable – net | $ 219 | $ 238 |
Accessorial Services |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accessorial services percent of total railway operating revenues | 5.00% | 5.00% | 4.00%

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