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Commitments and Contingencies (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 28, 2023
USD ($)
mi
Jun. 30, 2023
USD ($)
location
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
location
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
location
Feb. 03, 2023
railcar
Loss Contingencies [Line Items]              
Eastern Ohio incident expense   $ 416,000,000 $ 0 $ 803,000,000 $ 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   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      
Self-insured injury/damage to third party - up to   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      
Percentage of potential losses covered   82.00%   82.00%      
Self-insured NS owned property - and above, per occurrence   $ 75,000,000   $ 75,000,000      
Self-insured NS owned property - up to   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   264,000,000   581,000,000      
Payments for environmental liabilities       208,000,000      
Other Environmental Claims              
Loss Contingencies [Line Items]              
Environmental matters liabilities   60,000,000   60,000,000   $ 66,000,000  
Current environmental liability   $ 15,000,000   $ 15,000,000   $ 15,000,000  
Known cleanup and remediation locations and projects | location   82   82   85  
Number of sites - representative sample | location   19   19      
Liability associated with those sites   $ 49,000,000   $ 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   416,000,000   $ 803,000,000      
Cash expenditures attributable to the Incident       287,000,000      
Environmental matters liabilities   516,000,000   516,000,000      
Loss contingency recognized   77,000,000   105,000,000      
Loss contingency payments       25,000,000      
Incident-related expenses   $ 75,000,000   $ 117,000,000