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Federal Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Tax Credit Carryforward [Line Items] |  |  |
Operating loss carryforwards | $ 2,300,000,000 |  |
Valuation allowance | 0 |  |
Unrecognized tax benefits that would impact effective tax rate | 33,000,000 | $ 75,000,000 |
Decrease in unrecognized tax benefits is reasonably possible | 2,000,000 |  |
Unrecognized tax benefits, income tax penalties and interest expense | 0 | 0 | $ 0
Unrecognized tax benefits, income tax penalties and interest accrued | 0 | $ 0 |
Capital Loss Carryforward |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward, amount | 267,000,000 |  |
Internal Revenue Service (IRS) |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward, amount | $ 169,000,000 |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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