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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 3,250 | $ 2,799 | $ 6,165 | $ 5,438
Merchandise |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,853 | 1,680 | 3,525 | 3,288
Merchandise | Agriculture, forest and consumer products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 624 | 578 | 1,197 | 1,117
Merchandise | Chemicals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 552 | 494 | 1,050 | 953
Merchandise | Metals and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 420 | 402 | 795 | 772
Merchandise | Automotive |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 257 | 206 | 483 | 446
Intermodal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 972 | 801 | 1,826 | 1,520
Coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 425 | $ 318 | $ 814 | $ 630

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