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Commitments and Contingencies (Details)
1 Months Ended 12 Months Ended
Nov. 30, 2022
USD ($)
mi
Dec. 31, 2022
USD ($)
location
laborUnion
Dec. 31, 2021
USD ($)
location
Other Commitments [Line Items]      
Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag   Consolidated Balance Sheets  
Environmental liability   $ 66,000,000 $ 49,000,000
Current environmental liability   $ 15,000,000 $ 15,000,000
Known cleanup and remediation locations and projects | location   85 88
Number of sites - representative sample | location   22  
Liability associated with those sites   $ 55,000,000  
Environmental locations representative sample liability payout period, in years   5 years  
Responsible locations with another party | location   8  
Employees covered by collective bargaining agreements   80.00%  
Number of labor unions | laborUnion   12  
Self-insured injury/damage to third parties - and above, per occurrence   $ 75,000,000  
Self-insured injury/damage to third party - up to   800,000,000  
Self-insured for bodily injury and property damage to third parties above, for specific perils   $ 1,100,000,000  
Self-insured, percentage of potential losses covered   82.00%  
Self-insured NS owned property - and above, per occurrence   $ 75,000,000  
Self-insured NS owned property - up to   275,000,000  
Purchase commitments   1,700,000,000  
November 2022 Railway Purchase      
Other Commitments [Line Items]      
Number of miles railway line purchased | mi 337    
Total purchase price of asset purchase $ 1,600,000,000    
Compensation and Benefits      
Other Commitments [Line Items]      
Railway Labor Agreements, additional expenses of pay increases and other benefits   54,000,000  
Purchased Services and Rents      
Other Commitments [Line Items]      
Railway Labor Agreements, additional expenses of pay increases and other benefits   $ 2,000,000