Reinsurance (Narrative) (Details) $ in Thousands								3 Months Ended			9 Months Ended		21 Months Ended	24 Months Ended	36 Months Ended			48 Months Ended
	Apr. 01, 2023 USD ($)	Jan. 01, 2022 USD ($)	Jul. 01, 2019	Jul. 01, 2017	Jul. 01, 2012	Dec. 31, 2010	Dec. 31, 2009	Sep. 30, 2023 USD ($) counterparty	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2023 USD ($) counterparty	Sep. 30, 2022 USD ($)	Dec. 31, 2016	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2016	Dec. 31, 2013	Dec. 31, 2017	Dec. 31, 2013	Dec. 31, 2022 USD ($)		Oct. 01, 2021 USD ($)
Effects of Reinsurance [Line Items]
Deposit assets on reinsurance								$ 1,601,000			$ 1,601,000									$ 828,000
Funds witheld liabilities								1,398,000			1,398,000									705,000
Ceded Premiums								(372,859)	$ (398,109)		(1,144,655)	$ (1,210,547)
Policy loan assets								1,455,484			1,455,484									505,367
Deferred Reinsurance Gain								1,698,777	1,512,799	$ 252,736	1,698,777	1,512,799								1,492,856
Reinsurance recoverables								$ 36,860,011			$ 36,860,011									37,096,562	[1]
Number of counterparties | counterparty								2			2
Impacts of Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance recoverables								$ 36,860,011			$ 36,860,011									37,096,562
PAR U
Effects of Reinsurance [Line Items]
Reinsurance recoverables								15,272,691			15,272,691									15,051,337
PURC
Effects of Reinsurance [Line Items]
Reinsurance recoverables								7,169,637			7,169,637									6,928,950
PARCC
Effects of Reinsurance [Line Items]
Reinsurance recoverables								2,237,002			2,237,002									2,437,589
GUL Re
Effects of Reinsurance [Line Items]
Reinsurance recoverables								3,096,035			3,096,035									3,124,697
PAR Term
Effects of Reinsurance [Line Items]
Reinsurance recoverables								1,902,278			1,902,278									2,040,599
Term Re
Effects of Reinsurance [Line Items]
Reinsurance recoverables								1,829,064			1,829,064									1,830,197
Prudential Insurance
Effects of Reinsurance [Line Items]
Reinsurance recoverables								1,112,606			1,112,606									986,013
Lotus Re
Effects of Reinsurance [Line Items]
Reinsurance recoverables								2,034,218			2,034,218									1,952,215
DART
Effects of Reinsurance [Line Items]
Reinsurance recoverables								604,117			604,117									578,462
Ohio National
Effects of Reinsurance [Line Items]
Deferred Reinsurance Gain	$ 277,000
Reinsure aprox amount of account values of PDI traditional variable annuity contracts	$ 10,000,000
Percent of total reinsured block	0.10
Ohio National | Separate account liabilities under MODCO
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage	100.00%
Ohio National | General account liabilities under MODCO
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage	100.00%
Union Hamilton
Effects of Reinsurance [Line Items]
Reinsurance recoverables								2,300,000			2,300,000
Union Hamilton | Quote Share Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage													50.00%
Variable Annuities
Effects of Reinsurance [Line Items]
Deferred Reinsurance Gain								266,868	0	0	266,868	0								0
Variable Annuities | FLIAC
Effects of Reinsurance [Line Items]
Funds held under reinsurance agreements								5,300,000			5,300,000
Fixed Annuities
Effects of Reinsurance [Line Items]
Deferred Reinsurance Gain								50,785	$ 59,520	$ 78,138	50,785	$ 59,520								$ 57,898
Fixed Annuities | FLIAC
Effects of Reinsurance [Line Items]
Funds held under reinsurance agreements								$ 2,000,000			$ 2,000,000
Percent of total reinsured block								0.80			0.80
Affiliated Entity | PAR U
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage					95.00%	70.00%
Affiliated Entity | PURC
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage																95.00%	70.00%
Affiliated Entity | PARCC
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage			100.00%				90.00%
Affiliated Entity | GUL Re
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage				30.00%											95.00%
Affiliated Entity | PAR Term
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage			100.00%																95.00%
Affiliated Entity | Term Re
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage																		95.00%
Affiliated Entity | Prudential Insurance
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage											100.00%
Affiliated Entity | Prudential Insurance | Impacts of Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance agreement loss		$ (305,000)
Affiliated Entity | Lotus Re | Impacts of Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance liabilities associated with the risks of the coinsurance agreement																						$ 32,000
Reinsurance agreement ceded risk										100.00%
Net liabilities associated with the transaction for coinsurance										$ 1,387,000
Net liabilities associated with the transaction for modified coinsurance										14,037,000
Policy loan assets										855,000
Cash received										820,000
Recognized gain										$ 1,352,000
Affiliated Entity | DART
Effects of Reinsurance [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage														95.00%

[1] Prior period amounts adjusted for the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.