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Properties - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 26, 2021
USD ($)
property
phase
Property, Plant and Equipment [Line Items]              
Percentage of labor costs relating to the deconstruction of old track     20.00% 20.00%      
Percentage of labor costs relating to the installation of new track     80.00% 80.00%      
Percentage of assets depreciated under the group-life method     86.00% 86.00%      
Properties     $ 46,505,000,000 $ 46,505,000,000 $ 45,530,000,000    
Depreciation expense       1,420,000,000 1,383,000,000 $ 1,349,000,000  
Gains on sale of properties       454,000,000 35,000,000 151,000,000  
Proceeds from property sale transaction       529,000,000 56,000,000 254,000,000  
Gain recognized on property sale transaction       454,000,000 35,000,000 151,000,000  
Impairment expense       2,000,000 22,000,000 $ 8,000,000  
Equipment assets              
Property, Plant and Equipment [Line Items]              
Properties     10,125,000,000 $ 10,125,000,000 10,227,000,000    
Life studies, frequency period       3 years      
Road and track assets              
Property, Plant and Equipment [Line Items]              
Properties     34,076,000,000 $ 34,076,000,000 $ 33,109,000,000    
Life studies, frequency period       6 years      
Virginia Line Segments              
Property, Plant and Equipment [Line Items]              
Number of property rights for sale | property             3
Number phases to complete property right sale transaction | phase             3
Total property sale transaction price             $ 525,000,000
Proceeds from property sale transaction $ 200,000,000   200,000,000        
Gain recognized on property sale transaction $ 349,000,000   $ 0        
Virginia Line Segments | Subsequent Event              
Property, Plant and Equipment [Line Items]              
Gain recognized on property sale transaction   $ 20,000,000