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Long-Term Debt And Lease Obligation
 12 Months Ended
Dec. 31, 2024
Long-Term Debt and Lease Obligation [Abstract]  
Long-Term Debt and Lease Obligation Long-Term Debt and Lease Obligations
This table summarizes the principal amounts of our long-term debt excluding unamortized discounts, none of which are encumbered by rating triggers:
(Dollars in millions) Book valuePrincipal amount
 Interest rate Year of
 issue		 At December 31,At December 31,
 2024202320242023
6.900%1998Senior debentures, due 2028$27 $27 $28 $28 
6.920%2005Senior debentures, due 2028391 391 391 391 
6.125%2004Senior notes, due 2034372 372 374 374 
  Total$790 $790 $793 $793 
 
The finance lease term for equipment and autos is three to six years while the operating lease term for real estate properties is typically five years. Lease obligations totaled $60 million and $59 million in 2024 and 2023, respectively. Below are the lease obligations we expect to pay through 2030 and thereafter including $7 million of interest for finance and operating leases:
(Dollars in millions)Years ended December 31,
 202520262027202820292030 and thereafter
Finance lease obligations$16 $13 $10 $9 $6 $3 
Operating lease obligations3 3 2 1 1 — 
   Total lease obligations$19 $16 $12 $10 $7 $3 

The following table provides lease cost and other information:
(Dollars in millions)Years ended December 31,
202420232022
Lease cost:
   Finance lease cost$16 $14 $14 
   Operating lease cost3 3 5 
Total lease cost$19 $17 $19 
Other information finance leases:
   Finance cash outflows $17 $16 $15 
Weighted average discount rate4.88 %4.35 %3.20 %
Weighted average remaining lease term in years3.963.893.49
Other information operating leases:
   Operating cash outflows $3 $3 $4 
Weighted average discount rate4.44 %4.66 %3.44 %
Weighted average remaining lease term in years3.474.304.53