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Policyholder Liabilities (Account Balances by Guaranteed Minimum Interest Rates) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 60,226,094 | $ 58,781,836 |
Fixed Index Annuities |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 55,001,341 | 53,826,234 | $ 55,003,305
Allocated to index strategies | 46,111,051 | 45,550,513 |
Fixed Index Annuities | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 2,141,089 | $ 1,184,711 |
Fixed Index Annuities | 0.00% - 0.50% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 0.00% | 0.00% |
Fixed Index Annuities | 0.00% - 0.50% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 0.50% | 0.50% |
Fixed Index Annuities | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 5,672,666 | $ 5,857,020 |
Fixed Index Annuities | 0.50% - 1.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 0.50% | 0.50% |
Fixed Index Annuities | 0.50% - 1.00% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.00% | 1.00% |
Fixed Index Annuities | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 54,114 | $ 60,977 |
Fixed Index Annuities | 1.00% - 1.50% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.00% | 1.00% |
Fixed Index Annuities | 1.00% - 1.50% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.50% | 1.50% |
Fixed Index Annuities | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 50 | $ 57 |
Fixed Index Annuities | 1.50% - 2.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.50% | 1.50% |
Fixed Index Annuities | 1.50% - 2.00% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00% |
Fixed Index Annuities | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 204,700 | $ 233,272 |
Fixed Index Annuities | 2.00% - 2.50% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00% |
Fixed Index Annuities | 2.00% - 2.50% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.50% | 2.50% |
Fixed Index Annuities | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 817,671 | $ 939,684 |
Fixed Index Annuities | 2.50% - 3.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.50% | 2.50% |
Fixed Index Annuities | 2.50% - 3.00% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00% |
Fixed Index Annuities | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 0 | $ 0 |
Fixed Index Annuities | Greater than 3.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00% |
Fixed Index Annuities | At guaranteed minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 3,368,075 | $ 3,546,181 |
Fixed Index Annuities | At guaranteed minimum | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | At guaranteed minimum | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 2,379,142 | 2,421,795 |
Fixed Index Annuities | At guaranteed minimum | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 45,031 | 51,586 |
Fixed Index Annuities | At guaranteed minimum | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 50 | 57 |
Fixed Index Annuities | At guaranteed minimum | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 126,181 | 133,059 |
Fixed Index Annuities | At guaranteed minimum | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 817,671 | 939,684 |
Fixed Index Annuities | At guaranteed minimum | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | 1 to 50 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 1,981,746 | 1,670,284 |
Fixed Index Annuities | 1 to 50 | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 833,693 | 462,356 |
Fixed Index Annuities | 1 to 50 | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 1,060,459 | 1,098,332 |
Fixed Index Annuities | 1 to 50 | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 9,083 | 9,391 |
Fixed Index Annuities | 1 to 50 | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | 1 to 50 | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 78,511 | 100,205 |
Fixed Index Annuities | 1 to 50 | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | 1 to 50 | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | 51 to 150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 2,572,110 | 2,666,426 |
Fixed Index Annuities | 51 to 150 | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 466,501 | 407,426 |
Fixed Index Annuities | 51 to 150 | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 2,105,601 | 2,258,992 |
Fixed Index Annuities | 51 to 150 | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | 51 to 150 | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | 51 to 150 | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 8 | 8 |
Fixed Index Annuities | 51 to 150 | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | 51 to 150 | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | Greater than 150 basis points above |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 968,359 | 392,830 |
Fixed Index Annuities | Greater than 150 basis points above | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 840,895 | 314,929 |
Fixed Index Annuities | Greater than 150 basis points above | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 127,464 | 77,901 |
Fixed Index Annuities | Greater than 150 basis points above | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | Greater than 150 basis points above | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | Greater than 150 basis points above | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | Greater than 150 basis points above | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Index Annuities | Greater than 150 basis points above | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 6,549,813 | 6,589,577 | $ 6,860,060
Fixed Rate Annuities | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 52 | $ 61 |
Fixed Rate Annuities | 0.00% - 0.50% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 0.00% | 0.00% |
Fixed Rate Annuities | 0.00% - 0.50% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 0.50% | 0.50% |
Fixed Rate Annuities | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 5,050,826 | $ 4,961,020 |
Fixed Rate Annuities | 0.50% - 1.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 0.50% | 0.50% |
Fixed Rate Annuities | 0.50% - 1.00% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.00% | 1.00% |
Fixed Rate Annuities | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 442,974 | $ 454,959 |
Fixed Rate Annuities | 1.00% - 1.50% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.00% | 1.00% |
Fixed Rate Annuities | 1.00% - 1.50% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.50% | 1.50% |
Fixed Rate Annuities | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 618,495 | $ 655,703 |
Fixed Rate Annuities | 1.50% - 2.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 1.50% | 1.50% |
Fixed Rate Annuities | 1.50% - 2.00% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00% |
Fixed Rate Annuities | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 17,893 | $ 21,909 |
Fixed Rate Annuities | 2.00% - 2.50% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00% |
Fixed Rate Annuities | 2.00% - 2.50% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.50% | 2.50% |
Fixed Rate Annuities | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 372,341 | $ 441,459 |
Fixed Rate Annuities | 2.50% - 3.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.50% | 2.50% |
Fixed Rate Annuities | 2.50% - 3.00% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00% |
Fixed Rate Annuities | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 47,232 | $ 54,466 |
Fixed Rate Annuities | Greater than 3.00% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00% |
Fixed Rate Annuities | At guaranteed minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 1,285,592 | $ 1,302,336 |
Fixed Rate Annuities | At guaranteed minimum | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 52 | 61 |
Fixed Rate Annuities | At guaranteed minimum | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 53,147 | 55,458 |
Fixed Rate Annuities | At guaranteed minimum | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 442,739 | 454,728 |
Fixed Rate Annuities | At guaranteed minimum | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 359,167 | 281,694 |
Fixed Rate Annuities | At guaranteed minimum | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 17,870 | 21,887 |
Fixed Rate Annuities | At guaranteed minimum | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 365,385 | 434,042 |
Fixed Rate Annuities | At guaranteed minimum | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 47,232 | 54,466 |
Fixed Rate Annuities | 1 to 50 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 217,972 | 307,960 |
Fixed Rate Annuities | 1 to 50 | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | 1 to 50 | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 178,358 | 203,523 |
Fixed Rate Annuities | 1 to 50 | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 235 | 231 |
Fixed Rate Annuities | 1 to 50 | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 32,400 | 96,767 |
Fixed Rate Annuities | 1 to 50 | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 23 | 22 |
Fixed Rate Annuities | 1 to 50 | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 6,956 | 7,417 |
Fixed Rate Annuities | 1 to 50 | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | 51 to 150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 4,060,535 | 4,277,256 |
Fixed Rate Annuities | 51 to 150 | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | 51 to 150 | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 3,833,822 | 4,000,203 |
Fixed Rate Annuities | 51 to 150 | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | 51 to 150 | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 226,713 | 277,053 |
Fixed Rate Annuities | 51 to 150 | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | 51 to 150 | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | 51 to 150 | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | Greater than 150 basis points above |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 985,714 | 702,025 |
Fixed Rate Annuities | Greater than 150 basis points above | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | Greater than 150 basis points above | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 985,499 | 701,836 |
Fixed Rate Annuities | Greater than 150 basis points above | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | Greater than 150 basis points above | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 215 | 189 |
Fixed Rate Annuities | Greater than 150 basis points above | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | Greater than 150 basis points above | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 0 | 0 |
Fixed Rate Annuities | Greater than 150 basis points above | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 0 | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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