Fair Values of Financial Instruments (Assumptions Used in Estimating Fair Value) (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Expected cost of annual call options	2.35%	2.35%
Fixed Index Annuities \| Minimum \| Contract Duration (Years), 1-5
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	1 year	1 year
Fixed Index Annuities \| Minimum \| Contract Duration (Years), 6-10
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	6 years	6 years
Fixed Index Annuities \| Minimum \| Contract Duration (Years), 11-15
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	11 years	11 years
Fixed Index Annuities \| Minimum \| Contract Duration (Years), 16-20
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	16 years	16 years
Fixed Index Annuities \| Minimum \| Contract Duration (Years), 20 or More
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	20 years	20 years
Fixed Index Annuities \| Maximum \| Contract Duration (Years), 1-5
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	5 years	5 years
Fixed Index Annuities \| Maximum \| Contract Duration (Years), 6-10
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	10 years	10 years
Fixed Index Annuities \| Maximum \| Contract Duration (Years), 11-15
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	15 years	15 years
Fixed Index Annuities \| Maximum \| Contract Duration (Years), 16-20
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Contract duration (years)	20 years	20 years
Fixed Index Annuities \| Average \| Contract Duration (Years), 1-5
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	1.92%	1.96%
Fixed Index Annuities \| Average \| Contract Duration (Years), 6-10
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	3.84%	3.71%
Fixed Index Annuities \| Average \| Contract Duration (Years), 11-15
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	3.73%	3.71%
Fixed Index Annuities \| Average \| Contract Duration (Years), 16-20
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	8.43%	8.97%
Fixed Index Annuities \| Average \| Contract Duration (Years), 20 or More
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	4.92%	4.91%

The expected cost of annual call options to be purchased in the future to fund index credits beyond the next policy anniversary date, which are based on estimated account value growth and historical review of our actual option costs.

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- Definition

Long Duration Contracts, Assumptions By Product And Guarantee, Contract Duration

+ References

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- Definition

Anticipated rate of future terminations of contracts in force as of the balance sheet date, which is included in determining the amount of the specified guaranteed benefit obligation as of the balance sheet date.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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