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Properties - Schedule of Net Properties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 44,805 $ 44,324
Accumulated Depreciation (12,807) (12,560)
Properties - Net 31,998 31,764
Total Road    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost 31,411 30,091
Accumulated Depreciation (8,323) (7,790)
Properties - Net 23,088 22,301
Rail and Other Track Material    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost 7,964 7,694
Accumulated Depreciation (1,698) (1,606)
Properties - Net $ 6,266 $ 6,088
Annual Depreciation Rate 2.50% 2.50%
Estimated useful life (Avg. Years) 40 years 40 years
Ties    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 5,860 $ 5,665
Accumulated Depreciation (1,557) (1,446)
Properties - Net $ 4,303 $ 4,219
Annual Depreciation Rate 3.70% 3.70%
Estimated useful life (Avg. Years) 27 years 27 years
Grading    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 2,757 $ 2,662
Accumulated Depreciation (572) (542)
Properties - Net $ 2,185 $ 2,120
Annual Depreciation Rate 1.40% 1.40%
Estimated useful life (Avg. Years) 72 years 72 years
Ballast    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 3,076 $ 2,994
Accumulated Depreciation (971) (921)
Properties - Net $ 2,105 $ 2,073
Annual Depreciation Rate 2.70% 2.70%
Estimated useful life (Avg. Years) 37 years 37 years
Bridges, Trestles, and Culverts    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 2,506 $ 2,405
Accumulated Depreciation (382) (356)
Properties - Net $ 2,124 $ 2,049
Annual Depreciation Rate 1.60% 1.60%
Estimated useful life (Avg. Years) 61 years 61 years
Signals and Interlockers    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 2,975 $ 2,759
Accumulated Depreciation (693) (588)
Properties - Net $ 2,282 $ 2,171
Annual Depreciation Rate 4.00% 4.00%
Estimated useful life (Avg. Years) 25 years 25 years
Buildings    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 1,318 $ 1,278
Accumulated Depreciation (486) (464)
Properties - Net $ 832 $ 814
Annual Depreciation Rate 2.50% 2.50%
Estimated useful life (Avg. Years) 40 years 40 years
Other    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 4,955 $ 4,634
Accumulated Depreciation (1,964) (1,867)
Properties - Net $ 2,991 $ 2,767
Annual Depreciation Rate 4.20% 4.20%
Estimated useful life (Avg. Years) 24 years 24 years
Total Equipment    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 11,092 $ 11,606
Accumulated Depreciation (4,484) (4,770)
Properties - Net 6,608 6,836
Locomotive    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost 5,661 6,083
Accumulated Depreciation (2,266) (2,490)
Properties - Net $ 3,395 $ 3,593
Annual Depreciation Rate 3.50% 3.50%
Estimated useful life (Avg. Years) 29 years 29 years
Freight Cars    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 3,093 $ 3,262
Accumulated Depreciation (882) (998)
Properties - Net $ 2,211 $ 2,264
Annual Depreciation Rate 2.90% 2.90%
Estimated useful life (Avg. Years) 35 years 35 years
Work Equipment and Other    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 2,338 $ 2,261
Accumulated Depreciation (1,336) (1,282)
Properties - Net $ 1,002 $ 979
Annual Depreciation Rate 7.40% 7.40%
Estimated useful life (Avg. Years) 14 years 14 years
Land    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost $ 1,845 $ 1,849
Properties - Net 1,845 1,849
Construction In Progress    
Property, Plant and Equipment, Net, by Type [Abstract]    
Cost 457 778
Properties - Net $ 457 $ 778