Leases (Tables)

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Schedule of Future Lease Payments and Balances related to Operating Leases

The following table presents information about future lease payments and balances related to operating leases as of December 31, 2025.

(Dollars in Millions)	December 2025
Maturity of Lease Liabilities	Lease Payments
2026	$	69
2027	62
2028	49
2029	44
2030	39
Thereafter	1,055
Total Undiscounted Operating Lease Payments	$	1,318
Less: Imputed Interest	(772)
Present Value of Operating Lease Liabilities	$	546

Future payments due to Conrail under the shared asset area agreements are shown in the table below.

(Dollars in Millions)	Conrail Shared
Years	Asset Agreement
2026	$	39
2027	39
2028	39
2029	16
2030	—
Thereafter	—
Total	$	133

Schedule of Balance Sheet Classification and Other Information of Company's Operating Leases

(Dollars in Millions)	2025			2024
Balance Sheet Classification
Right of Use Asset	$	464		$	487
Current Lease Liabilities (Included in Other Current Liabilities)	67			73
Long-term Lease Liabilities	479			486
Total Operating Lease Liabilities	$	546		$	559
Other Information
Weighted-average Remaining Lease Term for Operating Leases	30 years			30 years
Weighted-average Discount Rate for Operating Leases	5.1		%	5.1		%

Schedule of Operating Lease Costs

These amounts are shown in the table below.

	Years Ended
(Dollars in Millions)	2025		2024		2023
Rent Expense on Operating Leases	$	112	$	117	$	109