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Nature of Operations and Significant Accounting Policies - Narrative (Details)
mi in Thousands, carload in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
employee
railroad
port_terminal
state
terminal
mi
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
employee
railroad
carload
port_terminal
state
terminal
line_of_business
mi
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
employee
Jan. 01, 2019
USD ($)
Revenue from External Customer [Line Items]                        
Number of rail route miles | mi 20               20      
Rail network states number | state 23               23      
Number of ocean, river and lake ports serviced (more than) | port_terminal 70               70      
Number of short-line and regional railroads served (more than) | railroad 230               230      
Revenue $ 2,885 $ 2,978 $ 3,061 $ 3,013 $ 3,143 $ 3,129 $ 3,102 $ 2,876 $ 11,937 $ 12,250 $ 11,408  
Number of primary lines of business | line_of_business                 3      
Number of employees | employee 21,000               21,000      
Number of union employees | employee                 17,000      
Cost method, maximum percentage                 20.00%      
Operating lease right-of-use asset $ 532       $ 0       $ 532 0    
Operating lease liabilities $ 550               550      
Expenses related to management workforce reduction and other restructuring charges                 $ 0 $ 0 $ 325  
Accounting Standards Update 2016-02                        
Revenue from External Customer [Line Items]                        
Operating lease right-of-use asset                       $ 534
Operating lease liabilities                       $ 534
Management streamlining                        
Revenue from External Customer [Line Items]                        
Workforce reduction | employee                     950  
Expenses related to management workforce reduction and other restructuring charges                     $ 325  
Merchandise business                        
Revenue from External Customer [Line Items]                        
Number of carloads | carload                 2,700      
Percentage of total volume                 43.00%      
Percentage of total revenue                 64.00%      
Coal business                        
Revenue from External Customer [Line Items]                        
Number of carloads | carload                 843      
Percentage of total volume                 14.00%      
Percentage of total revenue                 17.00%      
Intermodal business                        
Revenue from External Customer [Line Items]                        
Number of carloads | carload                 2,700      
Percentage of total volume                 43.00%      
Percentage of total revenue                 15.00%      
Number of terminals | terminal 30               30      
Other business                        
Revenue from External Customer [Line Items]                        
Percentage of total revenue                 4.00%