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Fair Values of Financial Instruments (Assumptions Used in Estimating Fair Value) (Details) - Fixed Index Annuities | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Minimum | Contract Duration (Years), 1-5 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 1 year | 1 year
Minimum | Contract Duration (Years), 6-10 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 6 years | 6 years
Minimum | Contract Duration (Years), 11-15 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 11 years | 11 years
Minimum | Contract Duration (Years), 16-20 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 16 years | 16 years
Minimum | Contract Duration (Years), 20 or More |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 20 years | 20 years
Maximum | Contract Duration (Years), 1-5 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 5 years | 5 years
Maximum | Contract Duration (Years), 6-10 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 10 years | 10 years
Maximum | Contract Duration (Years), 11-15 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 15 years | 15 years
Maximum | Contract Duration (Years), 16-20 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 20 years | 20 years
Average | Contract Duration (Years), 1-5 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 2.07% | 2.17%
Average partial withdrawal rates | 1.87% | 1.86%
Average | Contract Duration (Years), 6-10 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 3.38% | 3.28%
Average partial withdrawal rates | 1.95% | 1.97%
Average | Contract Duration (Years), 11-15 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 3.58% | 3.63%
Average partial withdrawal rates | 1.81% | 1.86%
Average | Contract Duration (Years), 16-20 |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 10.44% | 8.55%
Average partial withdrawal rates | 2.89% | 2.96%
Average | Contract Duration (Years), 20 or More |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 4.92% | 4.90%
Average partial withdrawal rates | 1.82% | 1.81%

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