Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) - item	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2019	Dec. 31, 2012	Dec. 31, 2009
Product Information [Line Items]
Maximum Net Premium Ratio at Individual Cohort Level	100.00%
VOCRA [Member]
Product Information [Line Items]
Useful life	20 years
VODA [Member]
Product Information [Line Items]
Useful life	13 years
Commercial [Member]
Product Information [Line Items]
Number of missed payments to qualify as delinquent	2
Period In Which Loans No Longer Accrue Interest In Days	90 days
Number of missed payments to qualify loans as non-accrual	3
Loan-to-value ratio indicating principal is greater than collateral	100.00%
Maximum [Member] | Commercial [Member]
Product Information [Line Items]
Debt-service coverage ratio indicating property income not covering debt payments	1.0
Reinsurance Transactions, LNBAR [Member]
Product Information [Line Items]
No. of Years in Which Deferred Gain From Reinsurance Transaction is Recognized as Income	30 years
First Penn-Pacific Life Insurance Company [Member]
Product Information [Line Items]
Deferred Gain Reinsurance Transaction Income Recognition Period In Years				15 years
LNBAR [Member]
Product Information [Line Items]
Deferred Gain Reinsurance Transaction Income Recognition Period In Years		20 years	30 years
Resolution Life [Member]
Product Information [Line Items]
Deferred Gain Reinsurance Transaction Income Recognition Period In Years	30 years
No. of Years in Which Deferred Gain From Reinsurance Transaction is Recognized as Income	25 years
Athene Holding Ltd. [Member]
Product Information [Line Items]
Deferred Gain Reinsurance Transaction Income Recognition Period In Years	20 years