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Commitments and Contingencies (Details)
 1 Months Ended 12 Months Ended
Aug. 22, 2023
school_District
Jun. 30, 2023
USD ($)
Nov. 30, 2022
mi
Dec. 31, 2023
USD ($)
location
mi
Dec. 31, 2022
USD ($)
location
Dec. 31, 2021
USD ($)
Feb. 03, 2023
railcar
Other Commitments [Line Items]              
Eastern Ohio incident       $ 1,116,000,000 $ 0 $ 0  
Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration]       Eastern Ohio incident      
Environmental loss contingency, statement of financial position, extensible enumeration, not disclosed flag       Consolidated Balance Sheets      
Number of locations with one or more subsidiaries in conjunction with other parties identified as potentially responsible parties | location       8      
Employees covered by collective bargaining agreements, percentage       80.00%      
Percentage of potential losses covered by insurance on legal liabilities for bodily injury and property damage to third parties       93.00%      
Self-insured for bodily injury and property damage to third parties coverage amount, above       $ 75,000,000      
Self-insured for bodily injury and property damage to third parties coverage amount, up to       $ 734,000,000      
Percentage of potential losses covered by insurance on damage to property owned or in control       82.00%      
Self-insured coverage for potential losses on damage to property owned, above       $ 75,000,000      
Self-insured coverage for potential losses on damage to property owned, up to       275,000,000      
Purchase commitments       1,400,000,000      
November 2022 Railway Purchase              
Other Commitments [Line Items]              
Number of miles railway line purchased | mi     337        
Asset acquisition, consideration transferred, adjustment   $ 500,000          
Personal property transaction amount   $ 1,700,000,000          
Eastern Ohio Incident              
Other Commitments [Line Items]              
Environmental remediation expense       836,000,000      
Payments for environmental liabilities       517,000,000      
Number of school districts voluntarily dismissed actions | school_District 3            
Number of school districts as plaintiffs | school_District 6            
Other Environmental Claims              
Other Commitments [Line Items]              
Environmental matters liabilities       60,000,000 66,000,000    
Current environmental liability       $ 15,000,000 $ 15,000,000    
Known cleanup and remediation locations and projects | location       81 85    
Number of sites - representative sample | location       21      
Liability associated with those sites       $ 48,000,000      
Environmental locations representative sample liability payout period, in years       5 years      
Eastern Ohio Incident              
Other Commitments [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
Eastern Ohio incident       $ 1,100,000,000      
Insurance recoveries received       101,000,000      
Deferred tax asset, expenses deductible for tax purposed in future periods or offset with insurance recoveries       249,000,000      
Cash expenditures attributable to the Incident       652,000,000      
Accrual for loss contingencies associated with environmental matters and legal proceedings       $ 464,000,000      
Non-environmental legal actions, mile radius of class area | mi       30      
Loss contingency recognized       $ 116,000,000      
Loss contingency payments       34,000,000      
Incident-related expenses       $ 265,000,000