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Nature of Operations and Significant Accounting Policies (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2021 | Jun. 18, 2021 shares | Jun. 04, 2021 | Apr. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) state mi | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) state mi | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Mar. 26, 2021 USD ($) property phase | Dec. 31, 2020 USD ($)
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of rail route miles | mi |  |  |  |  |  | 19,500 |  | 19,500 |  |  |  |  |
Number of states rail network serves | state |  |  |  |  |  | 23 |  | 23 |  |  |  |  |
Gain recognized on property dispositions |  |  |  |  |  | $ 60 | $ 4 | $ 430 | $ 33 |  |  |  |
Proceeds from property dispositions |  |  |  |  |  |  |  | 297 | $ 51 |  |  |  |
Stock split conversion ratio | 3 |  | 3 |  |  |  |  |  |  |  |  |  |
Number of additional shares of common stock received for each share held after stock split (in shares) | shares |  | 2 |  |  |  |  |  |  |  |  |  |  |
Reclassification to other capital |  |  |  |  |  | (11,455) |  | (11,455) |  |  |  | $ (11,259) | [1]
Reclassification from retained earnings |  |  |  |  |  | 24 |  | 24 |  | $ 0 |  | 152 | [1]
Revision of Prior Period, Reclassification, Adjustment | Stock split reclassification adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification to other capital |  |  |  |  |  |  |  |  |  | 1,000 |  |  |
Reclassification from retained earnings |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
Non-Freight Receivables |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable recorded from sale of property |  |  |  |  |  | 402 |  | 402 |  |  |  | $ 224 |
Virginia Line Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of property rights for sale | property |  |  |  |  |  |  |  |  |  |  | 3 |  |
Number of phases to complete property rights sale transaction | phase |  |  |  |  |  |  |  |  |  |  | 3 |  |
Total sale price |  |  |  |  |  |  |  |  |  |  | $ 525 |  |
Gain recognized on property dispositions |  |  |  | $ 349 |  |  |  |  |  |  |  |  |
Proceeds from property dispositions |  |  |  | $ 200 |  |  |  |  |  |  |  |  |
Virginia Line Segments | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from property dispositions |  |  |  |  | $ 200 |  |  |  |  |  |  |  |
Virginia Line Segments | Non-Freight Receivables |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable recorded from sale of property |  |  |  |  |  | $ 168 |  | $ 168 |  |  |  |  |
[1] | Certain prior year data has been retroactively adjusted to reflect the stock split effective June 28, 2021 or reclassified to conform to the current presentation. See accompanying notes to consolidated financial statements.

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