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Commitments and Contingencies - Eastern Ohio Incident (Details)
$ in Millions
 3 Months Ended 14 Months Ended
Aug. 22, 2023
school_District
Mar. 31, 2024
USD ($)
complaint
mi
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
complaint
mi
Dec. 31, 2023
USD ($)
Feb. 03, 2023
railcar
Eastern Ohio Incident            
Loss Contingencies [Line Items]            
Environmental matters liabilities   $ 292   $ 292 $ 319  
Environmental remediation expense   60 $ 286 896    
Payments for environmental liabilities   87 $ 31 604    
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   939   939 464  
East Ohio incident expense, net       1,700    
Insurance recoveries received   108   209    
Deferred tax asset, expenses deductible for tax purposed in future periods or offset with insurance recoveries   $ 248   $ 248 249  
Non-environmental legal actions, mile radius of class area | mi   30   30    
Litigation settlement, amount agreed and awarded to other party   $ 600        
Litigation settlement, Non-environmental legal actions, mile radius of all class action claims | mi   20   20    
Litigation settlement, Non-environmental legal actions, mile radius of personal injury claims | mi   10   10    
Number of school districts voluntarily dismissed actions | school_District 3          
Number of school districts as plaintiffs | school_District 6          
Estimated litigation liability   $ 676   $ 676 $ 82  
Loss contingency, number of pending claims | complaint   3   3