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Retirement Plans - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, cost   $ 28 $ 27 $ 24
Railroad retirement system contributions   671 711 586
CollectiveBargaining Arrangement, Other        
Defined Benefit Plan Disclosure [Line Items]        
Expensed incurred on premiums paid   $ 12 $ 16 $ 20
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Discount rate   5.61% 5.00% 5.21%
Loss on pre tax   $ 644 $ 643  
Defined benefit pension plan   $ 3,300 $ 3,600  
Expected return on plan assets, changes in fair value, period (in years)   5 years    
Expected return on plan assets (as a percent)   5.25% 5.25% 6.25%
Asset allocation target, evaluation period (in years)   3 years    
Weighted-average maturity of pension plan debt portfolio (in years)   22 years 22 years  
Other post retirement benefits liability   $ (555) $ (520)  
Other post retirement benefits periodic (benefit)/cost   $ (3) $ 0 $ 9
Pension Plan | Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Expected return on plan assets (as a percent) 5.25%      
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Discount rate   5.53% 4.97%  
Other post retirement benefits liability   $ 104 $ 104  
Other post retirement benefits periodic (benefit)/cost   $ (5) $ (7) $ (2)
401K Thrift Plan Before 2018        
Defined Benefit Plan Disclosure [Line Items]        
Employer matching contribution (as a percent)   50.00%    
Compensation contributed (as a percent)   6.00%    
401K Thrift Plan 2018 Beyond        
Defined Benefit Plan Disclosure [Line Items]        
Employer matching contribution (as a percent)   100.00%    
Compensation contributed (as a percent)   6.00%    
Contributing annual amount (as a percent)   3.00%