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Policyholder Liabilities (Account Balances by Guaranteed Minimum Interest Rates) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 60,980,242 | $ 60,901,641 |
Fixed Index Annuities |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 55,461,721 | 55,453,972 | $ 53,826,234
Allocated to index strategies | 46,561,493 | 46,529,959 |
Fixed Index Annuities | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 2,845,813 | $ 2,511,382 |
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 | $ 5,126,394 | $ 5,411,382 |
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 | $ 47,639 | $ 51,219 |
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 | $ 50 |
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 | $ 181,194 | $ 190,627 |
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 | $ 699,138 | $ 759,353 |
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 | $ 3,018,328 | $ 3,200,978 |
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 | 2,161,233 | 2,276,625 |
Fixed Index Annuities | At guaranteed minimum | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 39,737 | 43,029 |
Fixed Index Annuities | At guaranteed minimum | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 50 | 50 |
Fixed Index Annuities | At guaranteed minimum | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 118,170 | 121,921 |
Fixed Index Annuities | At guaranteed minimum | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 699,138 | 759,353 |
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 | 2,299,067 | 2,117,465 |
Fixed Index Annuities | 1 to 50 | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 1,265,350 | 1,032,438 |
Fixed Index Annuities | 1 to 50 | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 962,799 | 1,008,139 |
Fixed Index Annuities | 1 to 50 | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 7,902 | 8,190 |
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 | 63,016 | 68,698 |
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 | 2,323,135 | 2,462,003 |
Fixed Index Annuities | 51 to 150 | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 452,749 | 466,789 |
Fixed Index Annuities | 51 to 150 | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 1,870,378 | 1,995,206 |
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 | 1,259,698 | 1,143,567 |
Fixed Index Annuities | Greater than 150 basis points above | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 1,127,714 | 1,012,155 |
Fixed Index Annuities | Greater than 150 basis points above | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 131,984 | 131,412 |
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 | 5,726,033 | 5,913,965 | $ 6,589,577
Fixed Rate Annuities | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | $ 358 | $ 53 |
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 | $ 4,283,776 | $ 4,455,346 |
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 | $ 463,496 | $ 430,289 |
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 | $ 579,402 | $ 606,625 |
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 | $ 17,431 | $ 18,737 |
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 | $ 336,606 | $ 356,673 |
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 | $ 44,964 | $ 46,242 |
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 | $ 1,259,207 | $ 1,248,716 |
Fixed Rate Annuities | At guaranteed minimum | 0.00% - 0.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 358 | 53 |
Fixed Rate Annuities | At guaranteed minimum | 0.50% - 1.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 50,765 | 51,581 |
Fixed Rate Annuities | At guaranteed minimum | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 463,258 | 430,052 |
Fixed Rate Annuities | At guaranteed minimum | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 352,534 | 352,184 |
Fixed Rate Annuities | At guaranteed minimum | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 17,408 | 18,714 |
Fixed Rate Annuities | At guaranteed minimum | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 329,920 | 349,890 |
Fixed Rate Annuities | At guaranteed minimum | Greater than 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 44,964 | 46,242 |
Fixed Rate Annuities | 1 to 50 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 202,142 | 208,891 |
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 | 167,501 | 172,470 |
Fixed Rate Annuities | 1 to 50 | 1.00% - 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 238 | 237 |
Fixed Rate Annuities | 1 to 50 | 1.50% - 2.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 27,694 | 29,378 |
Fixed Rate Annuities | 1 to 50 | 2.00% - 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 23 | 23 |
Fixed Rate Annuities | 1 to 50 | 2.50% - 3.00% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance | 6,686 | 6,783 |
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 | 1,678,125 | 3,038,226 |
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 | 1,479,169 | 2,813,380 |
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 | 198,956 | 224,846 |
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 | 2,586,559 | 1,418,132 |
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 | 2,586,341 | 1,417,915 |
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 | 218 | 217 |
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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