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Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022 and 2021 (dollars in millions):
|  | 2022 |  | 2021
$400 million 4.70% Senior Notes due 2023 |  | $ | 400 |  |  | $ | 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 |  |  | 597 |
$100 million 4.09% Promissory Note due 2039 |  | 77 |  |  | 80 |
$400 million 6.20% Subordinated Debentures due 2042 |  | — |  |  | 400 |
$500 million 4.00% Surplus Notes due 2051 |  | 500 |  |  | 500 |
$700 million 7.125% Subordinated Debentures due 2052 |  | 700 |  |  | — |
$400 million 5.75% Subordinated Debentures due 2056 |  | 400 |  |  | 400 |
$400 million Variable Rate Junior Subordinated Debentures due 2065 |  | 319 |  |  | 319 |
Sub-total |  | 3,993 |  |  | 3,695 |
Unamortized issuance costs |  | (32) |  |  | (28) |
Long-term Debt |  | $ | 3,961 |  |  | $ | 3,667 |
Schedule of Maturities of Long-term Debt [Table Text Block] | Future principal payments due on long-term debt, excluding discounts, as of December 31, 2022, were as follows (dollars in millions):
| Calendar Year
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | Thereafter
Long-term debt | $ | 403 |  |  | $ | 3 |  |  | $ | 4 |  |  | $ | 404 |  |  | $ | 4 |  |  | $ | 3,179 |
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, 2022 and 2021 (dollars in millions):
|  |  |  |  | Amount Utilized(1) December 31, |  |
Current Capacity |  |  | Maturity Date |  | 2022 |  | 2021 |  | Basis of Fees
$ | 850 |  |  |  | August 2023 |  | $ | 1 |  |  | $ | 21 |  |  | Senior unsecured long-term debt rating
500 |  |  |  | November 2023 |  | 346 |  |  | 376 |  |  | Debt rating and utilization %
3 |  | (2) |  | December 2023 |  | 3 |  |  | 80 |  |  | Fixed
100 |  |  |  | February 2024 |  | 97 |  |  | 51 |  |  | Fixed
125 |  |  | March 2024 |  | 103 |  |  | 108 |  |  | Fixed
100 |  |  | August 2024 |  | 30 |  |  | 40 |  |  | Fixed
100 |  |  |  | May 2025 |  | 70 |  |  | 70 |  |  | Fixed
(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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