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Railway Operating Revenues - Schedule of Account Receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Revenue, payment terms 15 days    
Accounts receivable – net $ 848 $ 920  
Allowance for credit loss, writeoff   32  
Trade Accounts Receivable      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts receivable – net 629 682  
Accounts receivable, net, noncurrent 23 23  
Other Receivables      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts receivable – net $ 219 $ 238  
Accessorial Services      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accessorial services percent of total railway operating revenues 5.00% 5.00% 4.00%