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Future Policy Benefits - Schedule of Amount of Discounted (using the then current discount rate) and Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Expected future benefit payments, Undiscounted | $ 33,841,648 | $ 33,966,483
Expected future benefit payments, Discounted | 20,674,656 | 20,155,489
Expected future gross premiums, Undiscounted | 39,267,157 | 39,389,917
Expected future gross premiums, Discounted | $ 27,188,836 | $ 26,414,010

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- Definition Amount, before effect of reinsurance, of discounted balance for expected future gross premium component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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- Definition Amount, before effect of reinsurance, of undiscounted balance for expected future policy benefit and expense component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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