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Income Taxes (Tables) | 3 Months Ended
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Mar. 31, 2024
Income Tax Disclosure [Abstract] |
Income Tax Rate Reconciliation |
Income Tax Rate Reconciliation
| Three Months Ended March 31, |  |
| 2024 | 2023 |  |  |
Tax provision at U.S. federal statutory rate | $ | 191 |  | $ | 137 |  |  |  |
Nontaxable investment income | (11) |  | (11) |  |  |  |
Decrease in deferred tax valuation allowance | (12) |  | (3) |  |  |  |
Stock-based compensation, net | (16) |  | (9) |  |  |  |
Other | 6 |  | 4 |  |  |  |
Provision for income taxes | $ | 158 |  | $ | 118 |  |  |  |
Summary of Income Tax Contingencies |
Rollforward of Unrecognized Tax Benefits |  |
| Three Months Ended March 31, |  |  |  |
| 2024 | 2023 |  |  |  |  |
Balance, beginning of period | $ | 26 |  | $ | 22 |  |  |  |  |  |
Gross increases - tax positions in current period | 1 |  | 1 |  |  |  |  |  |
Balance, end of period | $ | 27 |  | $ | 23 |  |  |  |  |  |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 19 -SubTopic 10 -Topic 740 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-19 + Details
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