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Commitments and Contingencies (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
location
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
location
Feb. 03, 2023
railcar
Loss Contingencies [Line Items]        
Eastern Ohio incident expense $ 387,000,000 $ 0    
Environmental loss contingency, statement of financial position, extensible enumeration, not disclosed flag Consolidated Balance Sheets   Consolidated Balance Sheets  
Responsible locations with another party | location 8      
Employees covered by collective bargaining agreements, percentage 80.00%      
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 injury/damage to third parties - and above, per occurrence for specific pollution releases $ 1,100,000,000      
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      
Eastern Ohio Incident        
Loss Contingencies [Line Items]        
Environmental remediation expense 317,000,000      
Payments for environmental liabilities 31,000,000      
Other Environmental Claims        
Loss Contingencies [Line Items]        
Environmental matters liabilities 61,000,000   $ 66,000,000  
Current environmental liability $ 15,000,000   $ 15,000,000  
Known cleanup and remediation locations and projects | location 85   85  
Number of sites - representative sample | location 20      
Liability associated with those sites $ 49,000,000      
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 $ 387,000,000      
Cash expenditures attributable to the Incident 55,000,000      
Environmental matters liabilities 332,000,000      
Loss contingency recognized 12,000,000      
Loss contingency payments $ 16,000,000