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Nature of Operations and Significant Accounting Policies - Narrative (Details)
carload in Thousands, $ in Millions
12 Months Ended
Jun. 18, 2021
shares
Jun. 04, 2021
Dec. 31, 2022
USD ($)
employee
carload
site
port_terminal
terminal
operatingSegment
railroad
line_of_business
state
mi
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Revenue from External Customer [Line Items]          
Number of rail route miles | mi     20,000    
Rail network states number | state     26    
Number of ocean, river and lake ports serviced (over) | port_terminal     70    
Number of short-line and regional railroads served (more than) | railroad     240    
Revenue     $ 14,853 $ 12,522 $ 10,583
Number of primary lines of business | line_of_business     4    
Number of operating segments | operatingSegment     2    
Number of reportable segments | site     1    
Number of employees (more than) | employee     22,500    
Number of union employees | employee     17,100    
Stock split conversion ratio   3      
Number of additional shares of common stock received for each share held after stock split (in shares) | shares 2        
Cost method, maximum percentage     20.00%    
Merchandise business          
Revenue from External Customer [Line Items]          
Revenue     $ 8,239 7,539 7,076
Number of carloads | carload     2,600    
Percentage of total volume     41.00%    
Percentage of total revenue     55.00%    
Intermodal business          
Revenue from External Customer [Line Items]          
Revenue     $ 2,306 2,039 1,702
Number of carloads | carload     697    
Percentage of total volume     48.00%    
Percentage of total revenue     16.00%    
Number of terminals | terminal     30    
Coal business          
Revenue from External Customer [Line Items]          
Revenue     $ 2,434 1,790 1,397
Number of carloads | carload     3,000    
Percentage of total volume     11.00%    
Percentage of total revenue     16.00%    
Trucking business          
Revenue from External Customer [Line Items]          
Revenue     $ 966 410 0
Percentage of total revenue     7.00%    
Other          
Revenue from External Customer [Line Items]          
Revenue     $ 908 $ 744 $ 408
Percentage of total revenue     6.00%