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Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] |
|  |  | December 31, 2023 |  | December 31, 2022
(Dollars in millions) | Interest Rate |  | Principal |  | Unamortized Debt Costs |  | Total |  | Principal |  | Unamortized Debt Costs |  | Total
Debentures: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, maturing 2029, interest rates fixed | 3.625% |  | $ | 350 |  |  | $ | (3) |  |  | $ | 347 |  |  | $ | 350 |  |  | $ | (4) |  |  | $ | 346 |
Amended Credit Facility, maturing 2028, interest rates variable | varies |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total |  |  | 350 |  |  | (3) |  |  | 347 |  |  | 350 |  |  | (4) |  |  | 346 |
Less: current portion |  |  | — |  |  |  |  | — |  |  | — |  |  |  |  | — |
Long-term portion |  |  | $ | 350 |  |  | $ | (3) |  |  | $ | 347 |  |  | $ | 350 |  |  | $ | (4) |  |  | $ | 346 |
Schedule of Maturities of Long-term Debt [Table Text Block] | The weighted average interest rate for all long-term debt at both December 31, 2023 and 2022 was approximately 3.6%. Required repayment of principal for long-term debt is as follows (dollars in millions):
Years ending December 31, |
2024 | $ | — |
2025 | — |
2026 | — |
2027 | — |
2028 | — |
2029 and thereafter | 350 |
Total | $ | 350 |

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