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Income Taxes | 6 Months Ended
--- | ---
Jun. 30, 2025
Income Tax Disclosure [Abstract] |
Income Taxes | 12. Income Taxes Income Tax Expense
Income Tax Rate Reconciliation
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 | 2024 |  | 2025 | 2024
Tax provision at U.S. federal statutory rate | $ | 261 |  | $ | 192 |  |  | $ | 426 |  | $ | 383 |
Nontaxable net investment income | (9) |  | (11) |  |  | (14) |  | (22) |
Other | (1) |  | (7) |  |  | (8) |  | (29) |
Provision for income taxes | $ | 251 |  | $ | 174 |  |  | $ | 404 |  | $ | 332 |
Uncertain Tax Positions
Rollforward of Unrecognized Tax Benefits |  |
| Three Months Ended June 30, |  | Six Months Ended June 30, |  |
| 2025 | 2024 |  | 2025 | 2024 |  |
Balance, beginning of period | $ | 24 |  | $ | 27 |  |  | $ | 24 |  | $ | 26 |  |  |
Gross increases - tax positions in current period | 1 |  | — |  |  | 1 |  | 1 |  |  |
Balance, end of period | $ | 25 |  | $ | 27 |  |  | $ | 25 |  | $ | 27 |  |  |
The entire amount of unrecognized tax benefits, if recognized, would affect the effective tax rate in the period of the release. The Company believes it is reasonably possible approximately $14 of its currently unrecognized tax benefits may be recognized by the end of 2025 as a result of a lapse of the applicable statute of limitations. Other Tax Matters H.R.1, known as the “One Big Beautiful Bill Act” was signed into law on July 4, 2025. This comprehensive budget reconciliation package consolidates a wide array of public policy priorities, reshaping federal policy across numerous sectors of the American economy, including taxation, healthcare, social safety nets, immigration, and education. The changes in H.R.1 are not expected to have a material impact on the Company's results of operations. The federal statute of limitations for the Company is closed through the 2020 tax year with the exception of net operating loss carryforwards utilized in open tax years and the Navigators pre-acquisition 2019 tax period. Management believes that adequate provision has been made in the Company's Condensed Consolidated Financial Statements for any potential adjustments that may result from tax examinations and other tax-related matters for all open tax years.

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