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Nature of Operations and Significant Accounting Policies (Details)
carload in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Jun. 28, 2021
Jun. 18, 2021
shares
Jun. 04, 2021
Dec. 31, 2021
USD ($)
employee
terminal
port_terminal
state
railroad
mi
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
employee
railroad
state
terminal
line_of_business
carload
port_terminal
mi
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Revenue from External Customer [Line Items]                            
Number of rail route miles | mi       19,500               19,500    
Rail network states number | state       23               23    
Number of ocean, river and lake ports serviced (over) | port_terminal       70               70    
Number of short-line and regional railroads served (more than) | railroad       230               230    
Revenue       $ 3,427 $ 3,292 $ 2,990 $ 2,813 $ 2,825 $ 2,648 $ 2,255 $ 2,855 $ 12,522 $ 10,583 $ 11,937
Number of primary lines of business | line_of_business                       4    
Number of employees (more than) | employee       20,900               20,900    
Number of union employees | employee                       16,500    
Stock split conversion ratio 3   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                       $ 7,539 7,076 7,589
Number of carloads | carload                       2,600    
Percentage of total volume                       41.00%    
Percentage of total revenue                       60.00%    
Intermodal business                            
Revenue from External Customer [Line Items]                            
Revenue                       $ 2,039 1,702 1,760
Number of carloads | carload                       706    
Percentage of total volume                       48.00%    
Percentage of total revenue                       16.00%    
Number of terminals | terminal       30               30    
Coal business                            
Revenue from External Customer [Line Items]                            
Revenue                       $ 1,790 1,397 2,070
Number of carloads | carload                       3,000    
Percentage of total volume                       11.00%    
Percentage of total revenue                       14.00%    
Trucking business                            
Revenue from External Customer [Line Items]                            
Revenue                       $ 410 0 0
Percentage of total revenue                       3.00%    
Other                            
Revenue from External Customer [Line Items]                            
Revenue                       $ 744 $ 408 $ 518
Percentage of total revenue                       7.00%