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Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Long-term advances from Conrail (Note 6) $ 534 $ 534
Non-current operating lease liability (Note 10) 287 316
Casualty and other claims (Note 17) 221 218
Non-current Eastern Ohio incident liability (Note 17) 118 0
Deferred compensation 80 91
Other 148 141
Total 1,839 1,759
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, obligations (Note 12) 279 255
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, obligations (Note 12) $ 172 $ 204