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Nature of Operations and Significant Accounting Policies (Details) carload in Thousands, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 28, 2021 | Jun. 18, 2021 shares | Jun. 04, 2021 | Dec. 31, 2021 USD ($) employee terminal port_terminal state railroad mi | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) employee railroad state terminal line_of_business carload port_terminal mi | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of rail route miles | mi |  |  |  | 19,500 |  |  |  |  |  |  |  | 19,500 |  |
Rail network states number | state |  |  |  | 23 |  |  |  |  |  |  |  | 23 |  |
Number of ocean, river and lake ports serviced (over) | port_terminal |  |  |  | 70 |  |  |  |  |  |  |  | 70 |  |
Number of short-line and regional railroads served (more than) | railroad |  |  |  | 230 |  |  |  |  |  |  |  | 230 |  |
Revenue |  |  |  | $ 3,427 | $ 3,292 | $ 2,990 | $ 2,813 | $ 2,825 | $ 2,648 | $ 2,255 | $ 2,855 | $ 12,522 | $ 10,583 | $ 11,937
Number of primary lines of business | line_of_business |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Number of employees (more than) | employee |  |  |  | 20,900 |  |  |  |  |  |  |  | 20,900 |  |
Number of union employees | employee |  |  |  |  |  |  |  |  |  |  |  | 16,500 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Cost method, maximum percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Merchandise business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 7,539 | 7,076 | 7,589
Number of carloads | carload |  |  |  |  |  |  |  |  |  |  |  | 2,600 |  |
Percentage of total volume |  |  |  |  |  |  |  |  |  |  |  | 41.00% |  |
Percentage of total revenue |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Intermodal business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 2,039 | 1,702 | 1,760
Number of carloads | carload |  |  |  |  |  |  |  |  |  |  |  | 706 |  |
Percentage of total volume |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |
Percentage of total revenue |  |  |  |  |  |  |  |  |  |  |  | 16.00% |  |
Number of terminals | terminal |  |  |  | 30 |  |  |  |  |  |  |  | 30 |  |
Coal business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 1,790 | 1,397 | 2,070
Number of carloads | carload |  |  |  |  |  |  |  |  |  |  |  | 3,000 |  |
Percentage of total volume |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |
Percentage of total revenue |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |
Trucking business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 410 | 0 | 0
Percentage of total revenue |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 744 | $ 408 | $ 518
Percentage of total revenue |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |

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