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Debt (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | The Company’s long-term debt consists of the following as of December 31, 2023 and 2022 (dollars in millions):
|  | 2023 |  | 2022
$400 million 4.70% Senior Notes due 2023 |  | $ | — |  |  | $ | 400 |
$400 million 3.95% Senior Notes due 2026 |  | 400 |  |  | 400 |
$600 million 3.90% Senior Notes due 2029 |  | 599 |  |  | 599 |
$600 million 3.15% Senior Notes due 2030 |  | 598 |  |  | 598 |
$400 million 6.00% Senior Notes due 2033 |  | 399 |  |  | — |
$100 million 4.09% Promissory Note due 2039 |  | 74 |  |  | 77 |
$500 million 7.125% Surplus Notes due 2043 |  | 475 |  |  | — |
$500 million 4.00% Surplus Notes due 2051 |  | 500 |  |  | 500 |
$700 million 7.125% Subordinated Debentures due 2052 |  | 700 |  |  | 700 |
$400 million 5.75% Subordinated Debentures due 2056 |  | 400 |  |  | 400 |
$400 million Variable Rate Junior Subordinated Debentures due 2065 |  | 319 |  |  | 319 |
Sub-total |  | 4,464 |  |  | 3,993 |
Unamortized issuance costs |  | (37) |  |  | (32) |
Long-term Debt |  | $ | 4,427 |  |  | $ | 3,961 |
Schedule of Maturities of Long-term Debt [Table Text Block] | Future principal payments due on long-term debt, excluding discounts, as of December 31, 2023, were as follows (dollars in millions):
| Calendar Year
| 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028 |  | Thereafter
Long-term debt | $ | 3 |  |  | $ | 4 |  |  | $ | 404 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 4,050 |
Schedule of Line of Credit Facilities [Table Text Block] | The following table provides additional information on the Company’s existing committed credit facilities as of December 31, 2023 and 2022 (dollars in millions):
|  |  |  |  | Amount Utilized(1) December 31, |  |
Current Capacity |  |  | Maturity Date |  | 2023 |  | 2022 |  | Basis of Fees
$ | 100 |  |  |  | February 2024 |  | $ | 97 |  |  | $ | 97 |  |  | Fixed
125 |  |  | March 2024 |  | 104 |  |  | 103 |  |  | Fixed
3 | (2) |  | December 2024 |  | 3 |  |  | 3 |  |  | Fixed
100 |  |  | August 2024 |  | 29 |  |  | 30 |  |  | Fixed
100 |  |  |  | May 2025 |  | 60 |  |  | 70 |  |  | Fixed
850 |  |  |  | March 2028 |  | — |  |  | 1 |  |  | Credit rating
500 |  |  |  | November 2028 |  | 99 |  |  | 346 |  |  | Credit rating and utilization %
(1)Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented. (2)Foreign currency denominated facility, amounts presented are in U.S. dollars.

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