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Nature of Operations and Significant Accounting Policies - Narrative (Details)
$ in Millions
3 Months Ended 21 Months Ended
Mar. 31, 2023
USD ($)
state
mi
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Mar. 26, 2021
property
phase
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Rail route network, distance | mi 20,000      
Number of states rail network serves | state 26      
Proceeds from sale of property, plant, and equipment $ 8 $ 8    
Gain (loss) on disposition of property plant equipment $ 8 27    
Virginia Line Segments        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of property rights for sale | property       3
Number of phases to complete property rights sale transaction | phase       3
Proceeds from sale of property, plant, and equipment     $ 525  
Gain (loss) on disposition of property plant equipment   $ 20 $ 493