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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2024
Income Tax Disclosure [Abstract] |
Income Tax Rate Reconciliation |
Income Tax Rate Reconciliation
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2024 | 2023 |  | 2024 | 2023
Tax provision at U.S. federal statutory rate | $ | 200 |  | $ | 171 |  |  | $ | 583 |  | $ | 449 |
Nontaxable investment income | (9) |  | (12) |  |  | (31) |  | (32) |
Other | (6) |  | 3 |  |  | (35) |  | (12) |
Provision for income taxes | $ | 185 |  | $ | 162 |  |  | $ | 517 |  | $ | 405 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
Rollforward of Unrecognized Tax Benefits |  |
| Three Months Ended September 30, |  | Nine Months Ended September 30, |  |
| 2024 | 2023 |  | 2024 | 2023 |  |
Balance, beginning of period | $ | 27 |  | $ | 23 |  |  | $ | 26 |  | $ | 22 |  |  |
Gross increases - tax positions in current period | 1 |  | 2 |  |  | 2 |  | 4 |  |  |
Gross decreases - tax positions in current period | (1) |  | — |  |  | (1) |  | — |  |  |
Lapse of statute of limitations | (4) |  | — |  |  | (4) |  | (1) |  |  |
Balance, end of period | $ | 23 |  | $ | 25 |  |  | $ | 23 |  | $ | 25 |  |  |

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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://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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