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Nature of Operations and Significant Accounting Policies (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
state
mi
Apr. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
state
mi
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
state
mi
Jun. 30, 2021
USD ($)
Mar. 26, 2021
USD ($)
phase
property
Revenue from External Customer [Line Items]                  
Number of rail route miles | mi 20,000   20,000       20,000    
Number of states rail network serves | state 26   26       26    
Proceeds from property dispositions             $ 29 $ 227  
Gain recognized on property dispositions     $ 129     $ 367 $ 156 $ 370  
Virginia Line Segments                  
Revenue from External Customer [Line Items]                  
Number of property rights for sale | property                 3
Number of phases to complete property rights sale transaction | phase                 3
Total sale price                 $ 525
Proceeds from property dispositions   $ 200     $ 200        
Gain recognized on property dispositions   $ 349 $ 122 $ 20          
Sale price, period approved amount $ 125