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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Schedule of Amount, Timing and Uncertainty of Cash Flows of Company's Operating Leases The following table presents information about the amount, timing and uncertainty of cash flows arising from all of the Company’s operating leases as of December 31, 2021.
(Dollars in Millions)December 2021
Maturity of Lease LiabilitiesLease Payments
2022$66 
202355 
202445 
202540 
202631 
Thereafter1,153 
Total undiscounted operating lease payments$1,390 
Less: Imputed interest(848)
Present value of operating lease liabilities$542 
Future payments due to Conrail under the shared asset area agreements are shown in the table below.
(Dollars in Millions)Conrail Shared
YearsAsset Agreement
2022$31 
202331 
202423 
2025— 
2026— 
Thereafter— 
Total$85 
  
Schedule of Balance Sheet Classification and Other Information of Company's Operating Leases
(Dollars in Millions)20212020
Balance Sheet Classification
Right of use asset$501 $472 
Current lease liabilities (included in other current liabilities)$64 $45 
Long-term lease liabilities478 455 
Total operating lease liabilities$542 $500 
Other Information
Weighted-average remaining lease term for operating leases32 years35 years
Weighted-average discount rate for operating leases4.9 %5.0 %
  
Schedule of Operating Lease Costs These amounts are shown in the table below.
 Fiscal Years
(Dollars in Millions)202120202019
Rent Expense on Operating Leases$89 $82 $84 
  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Current Liabilities Other Current Liabilities