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Investments - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]      
Deferred tax liabilities $ 6,815 $ 6,460  
Tax Cuts and Jobs Act of 2017, deferred tax liability, income tax benefit     $ 3,331
Future minimum lease payments, 2024 and subsequent years   267  
Shared Assets Areas CRC Lease      
Schedule of Investments [Line Items]      
Future annual minimum payments, due next five years 40    
Future minimum lease payments, 2024 and subsequent years $ 16    
Conrail Equity      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 58.00%    
Conrail Voting      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Conrail Inc.      
Schedule of Investments [Line Items]      
Pension plan status change in investment, affiliate $ (3) (11)  
Portion of pension plan change attributable to other comprehensive income (loss), affiliate (3) (10)  
Deferred tax liabilities   1  
Difference between investment in Conrail and share of Conrail's underlying net equity 497    
Equity in earnings of investee 53 55 75
Tax Cuts and Jobs Act of 2017, deferred tax liability, income tax benefit     33
Expenses from transactions with related party 149 150 141
General and administrative support to Conrail 6    
Due to Conrail, current 264 202  
Due to Conrail, noncurrent $ 280 $ 280  
Due to Conrail, average interest rate 2.90% 2.90%  
TTX Company      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 19.65%    
Equity in earnings of investee $ 58 $ 61 158
Tax Cuts and Jobs Act of 2017, deferred tax liability, income tax benefit     115
Purchased Services and Rent | TTX Company      
Schedule of Investments [Line Items]      
Expenses from transactions with related party $ 244 $ 262 $ 237