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Policyholder Liabilities (Account Balances by Guaranteed Minimum Interest Rates) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 60,901,641	$ 58,781,836
Fixed Index Annuities
Policyholder Account Balance [Line Items]
Policyholder account balance	55,453,972	53,826,234	$ 55,003,305
Allocated to index strategies	46,529,959	45,550,513
Fixed Index Annuities | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 2,511,382	$ 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	$ 5,411,382	$ 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	$ 51,219	$ 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	$ 190,627	$ 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	$ 759,353	$ 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	$ 3,200,978	$ 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	2,276,625	2,421,795
Fixed Index Annuities | At guaranteed minimum | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	43,029	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	121,921	133,059
Fixed Index Annuities | At guaranteed minimum | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	759,353	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	2,117,465	1,670,284
Fixed Index Annuities | 1 to 50 | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,032,438	462,356
Fixed Index Annuities | 1 to 50 | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,008,139	1,098,332
Fixed Index Annuities | 1 to 50 | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	8,190	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	68,698	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	2,462,003	2,666,426
Fixed Index Annuities | 51 to 150 | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	466,789	407,426
Fixed Index Annuities | 51 to 150 | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,995,206	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	1,143,567	392,830
Fixed Index Annuities | Greater than 150 basis points above | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,012,155	314,929
Fixed Index Annuities | Greater than 150 basis points above | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	131,412	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	5,913,965	6,589,577	$ 6,860,060
Fixed Rate Annuities | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 53	$ 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	$ 4,455,346	$ 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	$ 430,289	$ 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	$ 606,625	$ 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	$ 18,737	$ 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	$ 356,673	$ 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	$ 46,242	$ 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	$ 1,248,716	$ 1,302,336
Fixed Rate Annuities | At guaranteed minimum | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	53	61
Fixed Rate Annuities | At guaranteed minimum | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	51,581	55,458
Fixed Rate Annuities | At guaranteed minimum | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	430,052	454,728
Fixed Rate Annuities | At guaranteed minimum | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	352,184	281,694
Fixed Rate Annuities | At guaranteed minimum | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	18,714	21,887
Fixed Rate Annuities | At guaranteed minimum | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	349,890	434,042
Fixed Rate Annuities | At guaranteed minimum | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	46,242	54,466
Fixed Rate Annuities | 1 to 50
Policyholder Account Balance [Line Items]
Policyholder account balance	208,891	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	172,470	203,523
Fixed Rate Annuities | 1 to 50 | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	237	231
Fixed Rate Annuities | 1 to 50 | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	29,378	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	6,783	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	3,038,226	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	2,813,380	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	224,846	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	1,418,132	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	1,417,915	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	217	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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