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Nature of Operations and Significant Accounting Policies (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 19 Months Ended
Jun. 30, 2022
USD ($)
Apr. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
state
mi
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
state
mi
Sep. 30, 2021
USD ($)
Oct. 20, 2022
USD ($)
Mar. 26, 2021
USD ($)
phase
property
Revenue from External Customer [Line Items]                      
Number of rail route miles | mi     20,000         20,000      
Number of states rail network serves | state     26         26      
Proceeds               $ 51 $ 297    
Gains     $ 27       $ 60 183 430    
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   $ 200       $ 200   0 200    
Gains   $ 349   $ 122 $ 20     $ 142 $ 349    
Sale price, period approved amount $ 125                    
Virginia Line Segments | Subsequent Event                      
Revenue from External Customer [Line Items]                      
Proceeds                   $ 400  
Gains                   $ 491