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Commitments and Contingencies - Eastern Ohio Incident (Details) $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended | 20 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 11, 2024 USD ($) | May 23, 2024 USD ($) | Apr. 09, 2024 USD ($) | Aug. 22, 2023 schoolDistrict | Sep. 30, 2024 USD ($) complaint mi | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) complaint mi | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) complaint mi | Jun. 25, 2024 safetyRecommendation | Dec. 31, 2023 USD ($) | Feb. 03, 2023 railcar
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Eastern Ohio incident expenses |  |  |  |  | $ (159) | $ 163 | $ 368 | $ 966 |  |  |  |
Eastern Ohio Incident |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Environmental matters liabilities |  |  |  |  | 264 |  | 264 |  | $ 264 |  | $ 319 |
Environmental remediation expense |  |  |  |  | 51 | 118 | 164 | 699 | 1,000 |  |  |
Payments for environmental liabilities |  |  |  |  | 52 | 164 | 219 | 372 | 736 |  |  |
Eastern Ohio Incident | Pending Litigation | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consent Decree provisions enforcement period |  | 5 years |  |  |  |  |  |  |  |  |  |
Eastern Ohio Incident | Pending Litigation | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consent Decree provisions enforcement period |  | 20 years |  |  |  |  |  |  |  |  |  |
Eastern Ohio Incident | Pending Litigation | Oversight Costs |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount agreed and awarded to other party |  | $ 57 |  |  |  |  |  |  |  |  |  |
Eastern Ohio Incident | Pending Litigation | Civil Penalty |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount agreed and awarded to other party |  | $ 15 |  |  |  |  |  |  |  |  |  |
Eastern Ohio Incident |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of railcars derailed | railcar |  |  |  |  |  |  |  |  |  |  |  | 38
Number of non-Company-owned tank cars contained hazardous materials | railcar |  |  |  |  |  |  |  |  |  |  |  | 11
Number of tank cars with risk of catastrophic explosion | railcar |  |  |  |  |  |  |  |  |  |  |  | 5
Accrual for loss contingencies associated with environmental matters and legal proceedings |  |  |  |  | 800 |  | 800 |  | 800 |  | 464 |
Eastern Ohio incident expenses |  |  |  |  |  |  |  |  | 1,500 |  |  |
Insurance recoveries |  |  |  |  | 288 | $ 25 | 552 | $ 25 | 653 |  |  |
Deferred tax asset, expenses deductible for tax purposed in future periods or offset with insurance recoveries |  |  |  |  | $ 197 |  | $ 197 |  | $ 197 |  | 249 |
Litigation settlement, amount agreed and awarded to other party |  |  | $ 600 |  |  |  |  |  |  |  |  |
Non-environmental legal actions, mile radius of class area | mi |  |  |  |  | 30 |  | 30 |  | 30 |  |  |
Litigation settlement, non-environmental legal actions, mile radius of all class action claims | mi |  |  |  |  | 20 |  | 20 |  | 20 |  |  |
Litigation settlement, non-environmental legal actions, mile radius of personal injury claims | mi |  |  |  |  | 10 |  | 10 |  | 10 |  |  |
Number of school districts as plaintiffs | schoolDistrict |  |  |  | 6 |  |  |  |  |  |  |  |
Estimated litigation liability |  |  |  |  | $ 688 |  | $ 688 |  | $ 688 |  | $ 82 |
Loss contingency, number of pending claims | complaint |  |  |  |  | 6 |  | 6 |  | 6 |  |  |
Eastern Ohio Incident | NTSB |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of safety recommendations issued | safetyRecommendation |  |  |  |  |  |  |  |  |  | 30 |  |
Eastern Ohio Incident | NTSB | Norfolk Southern |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of safety recommendations issued | safetyRecommendation |  |  |  |  |  |  |  |  |  | 4 |  |
Eastern Ohio Incident | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment | $ 310 |  |  |  |  |  |  |  |  |  |  |

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