New Accounting Pronouncements - Reconciliation of Policyholder Obligations And Market Risk Benefits (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances	$ 7,285,129	$ 7,661,785	$ 7,964,609	$ 8,220,944	$ 8,378,037
Additional Liability for Benefits	151,787		118,645	115,151	119,374
Liability for Future Policy Benefits				1,234,748	1,302,788
Market Risk Benefits Liability				299,833	301,601
Domestic Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances				0	0
Additional Liability for Benefits				0	0
Liability for Future Policy Benefits				90,469	102,407
Market Risk Benefits Liability				0	0
Domestic Universal Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances	1,428,390	1,409,471	1,408,064	1,412,058	1,222,694
Additional Liability for Benefits	66,976	63,804	57,344	54,097	45,136
Liability for Future Policy Benefits				0	0
Market Risk Benefits Liability				0	0
International Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances				0	0
Additional Liability for Benefits				0	0
Liability for Future Policy Benefits				81,584	95,402
Market Risk Benefits Liability				0	0
International Universal Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances	541,346	575,096	609,039	647,586	677,900
Additional Liability for Benefits	46,020	46,402	47,805	48,336	63,046
Liability for Future Policy Benefits				0	0
Market Risk Benefits Liability				0	0
SPIAs With Life Contingencies
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances				0	0
Additional Liability for Benefits				0	0
Liability for Future Policy Benefits				244,550	238,127
Market Risk Benefits Liability				0	0
Annuities excl. SPIAs WLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances	$ 5,315,393	$ 5,677,218	$ 5,947,506	6,161,300	6,477,443
Additional Liability for Benefits				12,718	11,192
Liability for Future Policy Benefits				0	0
Market Risk Benefits Liability				299,833	301,601
ONL & Affiliates
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balances				0	0
Additional Liability for Benefits				0	0
Liability for Future Policy Benefits				818,145	866,852
Market Risk Benefits Liability				$ 0	$ 0