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Long-Term Debt And Lease Obligation (Tables) | 12 Months Ended
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Dec. 31, 2023
Long-Term Debt and Lease Obligation [Abstract] |
Schedule of Long-term Debt | 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 value |  | Principal amount
Interest rate |  | Year of issue |  |  |  | At December 31, |  | At December 31,
|  |  |  | 2023 |  | 2022 |  | 2023 |  | 2022
6.900% |  | 1998 |  | Senior debentures, due 2028 |  | $ | 27 |  |  | $ | 27 |  |  | $ | 28 |  |  | $ | 28 |
6.920% |  | 2005 |  | Senior debentures, due 2028 |  | 391 |  |  | 391 |  |  | 391 |  |  | 391 |
6.125% |  | 2004 |  | Senior notes, due 2034 |  | 372 |  |  | 371 |  |  | 374 |  |  | 374 |
|  |  |  | Total |  | $ | 790 |  |  | $ | 789 |  |  | $ | 793 |  |  | $ | 793 |
Lease Obligations Over Next Five Years and Thereafter | interest for finance and operating leases:
(Dollars in millions) | Years ended December 31, |  |
| 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028 |  | 2029 and thereafter
Finance lease obligations | $ | 16 |  |  | $ | 12 |  |  | $ | 9 |  |  | $ | 7 |  |  | $ | 6 |  |  | $ | 3 |
Operating lease obligations | 3 |  |  | 3 |  |  | 3 |  |  | 2 |  |  | 1 |  |  | — |
Total lease obligations | $ | 19 |  |  | $ | 15 |  |  | $ | 12 |  |  | $ | 9 |  |  | $ | 7 |  |  | $ | 3 |
Other Operating and Finance Lease Disclosure | The following table provides lease cost and other information:
(Dollars in millions) |  | Years ended December 31,
|  | 2023 |  | 2022 |  | 2021
Lease cost: |  |  |  |  |  |
Finance lease cost |  | $ | 14 |  |  | $ | 14 |  |  | $ | 15 |
Operating lease cost |  | 3 |  |  | 5 |  |  | 4 |
Total lease cost |  | $ | 17 |  |  | $ | 19 |  |  | $ | 19 |
Other information finance leases: |  |  |  |  |  |
Finance cash outflows |  | $ | 16 |  |  | $ | 15 |  |  | $ | 15 |
Weighted average discount rate |  | 4.35 | % |  | 3.20 | % |  | 2.46 | %
Weighted average remaining lease term in years |  | 3.89 |  | 3.49 |  | 3.45
Other information operating leases: |  |  |  |  |  |
Operating cash outflows |  | $ | 3 |  |  | $ | 4 |  |  | $ | 4 |
Weighted average discount rate |  | 4.66 | % |  | 3.44 | % |  | 2.86 | %
Weighted average remaining lease term in years |  | 4.30 |  | 4.53 |  | 4.37

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