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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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