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Debt (Narrative) (Details) - USD ($)
2 Months Ended 3 Months Ended 6 Months Ended
Mar. 15, 2018
Mar. 15, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Feb. 12, 2018
Debt Instrument [Line Items]              
Commercial paper issued       $ 6,500,000,000      
Commercial paper repaid       $ 6,000,000,000.0      
Commercial paper maturity duration minimum       1 day      
Commercial paper maturity duration maximum       32 days      
Commercial paper outstanding       $ 675,000,000      
Board of Directors authorized debt issuance             $ 6,000,000,000
Board of Directors remaining debt issuance       3,000,000,000.0      
Secured debt under receivables securitization facility       400,000,000   $ 400,000,000  
Early extinguishment charge [1]         $ 85,000,000    
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Revolving credit facility available credit       $ 2,000,000,000.0      
Facility expiration date       Jun. 08, 2023      
Credit facility term       5 years      
Revolving credit facility withdrawals       $ 0      
Allowable debt per debt to earnings before interest taxes depreciation and amortization coverage ratio (as defined in the facility)       38,900,000,000      
Outstanding debt (as defined by facility)       26,100,000,000      
Cross-default provision (as defined by facility)       $ 150,000,000      
Debt Redemption [Member]              
Debt Instrument [Line Items]              
Redemption date Mar. 15, 2018            
Weighted average interest rate of bonds and debentures 4.90% 4.90%          
Fixed rate debt securities carrying value $ 70,000,000 $ 70,000,000          
Early extinguishment charge     $ 85,000,000        
Missouri Pacific 5 Percent Income Debentures due 2045 [Member]              
Debt Instrument [Line Items]              
Interest rate 5.00% 5.00%          
Maturity date   Jan. 01, 2045          
Principal outstanding $ 96,000,000 $ 96,000,000          
Chicago and Eastern Illinois 5 Percent Income Debentures Due 2054 [Member]              
Debt Instrument [Line Items]              
Interest rate 5.00% 5.00%          
Maturity date   Jan. 01, 2054          
Principal outstanding $ 2,000,000 $ 2,000,000          
Missouri Pacific 4.75 Percent General Mortgage Income Bonds Series A Due 2020 [Member]              
Debt Instrument [Line Items]              
Interest rate 4.75% 4.75%          
Maturity date   Jan. 01, 2020          
Principal outstanding $ 30,000,000 $ 30,000,000          
Missouri Pacific 4.75 Percent General Mortgage Income Bonds Series B Due 2030 [Member]              
Debt Instrument [Line Items]              
Interest rate 4.75% 4.75%          
Maturity date   Jan. 01, 2030          
Principal outstanding $ 27,000,000 $ 27,000,000          
[1] 2018 includes a debt extinguishment charge for the early redemption of certain bonds and debentures in the first quarter (Note 14).