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Commitments and Contingencies (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 28, 2023
USD ($)
Sep. 30, 2023
USD ($)
location
schoolDistrict
mi
Aug. 21, 2023
schoolDistrict
Nov. 30, 2022
mi
Sep. 30, 2023
USD ($)
location
mi
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
location
mi
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
location
Feb. 03, 2023
railcar
Loss Contingencies [Line Items]                    
Eastern Ohio incident expense         $ 163,000,000 $ 0 $ 966,000,000 $ 0    
Environmental loss contingency, statement of financial position, extensible enumeration, not disclosed flag             Consolidated Balance Sheets   Consolidated Balance Sheets  
Number of locations with one or more subsidiaries in conjunction with other parties identified as potentially responsible parties | location   8     8   8      
Employees covered by collective bargaining agreements, percentage             80.00%      
Self-insured injury/damage to third parties - and above, per occurrence   $ 75,000,000     $ 75,000,000   $ 75,000,000      
Self-insured injury/damage to third party - up to   800,000,000     800,000,000   800,000,000      
Self-insured injury/damage to third parties - and above, per occurrence for specific pollution releases   $ 1,100,000,000     $ 1,100,000,000   $ 1,100,000,000      
Percentage of potential losses covered   82.00%     82.00%   82.00%      
Self-insured NS owned property - and above, per occurrence   $ 75,000,000     $ 75,000,000   $ 75,000,000      
Self-insured NS owned property - up to   275,000,000     275,000,000   275,000,000      
November 2022 Railway Purchase                    
Loss Contingencies [Line Items]                    
Number of miles railway line purchased | mi       337            
Asset acquisition, consideration transferred, adjustment $ 500,000                  
Asset acquisition, period after all conditions satisfied for closing 5 days                  
November 2022 Railway Purchase | Minimum                    
Loss Contingencies [Line Items]                    
Personal property transaction amount $ 1,600,000,000                  
November 2022 Railway Purchase | Maximum                    
Loss Contingencies [Line Items]                    
Personal property transaction amount $ 1,700,000,000                  
Eastern Ohio Incident                    
Loss Contingencies [Line Items]                    
Environmental remediation expense         118,000,000   699,000,000      
Payments for environmental liabilities             372,000,000      
Other Environmental Claims                    
Loss Contingencies [Line Items]                    
Environmental matters liabilities   59,000,000     59,000,000   59,000,000   $ 66,000,000  
Current environmental liability   $ 15,000,000     $ 15,000,000   $ 15,000,000   $ 15,000,000  
Known cleanup and remediation locations and projects | location   81     81   81   85  
Number of sites - representative sample | location   20     20   20      
Liability associated with those sites   $ 47,000,000     $ 47,000,000   $ 47,000,000      
Environmental locations representative sample liability payout period, in years             5 years      
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
Eastern Ohio incident expense         163,000,000   $ 966,000,000      
Insurance receivable   25,000,000     25,000,000   25,000,000      
Cash expenditures attributable to the Incident             511,000,000      
Environmental matters liabilities   $ 455,000,000     $ 455,000,000   $ 455,000,000      
Non-environmental legal actions, mile radius of class area | mi   30     30   30      
Non-environmental legal actions, number of school districts as plaintiffs | schoolDistrict   4 3              
Loss contingency recognized             $ 105,000,000      
Loss contingency payments             30,000,000      
Incident-related expenses         $ 70,000,000   $ 187,000,000