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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 37,813,550	$ 44,866,019
Fair value	32,084,932	39,804,617	[1]
Fixed Maturities, NAIC Rated Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	37,755,156	44,866,019
Fair value	32,004,591	39,804,617
NAIC, Class 1 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	22,103,730	27,061,903
Fair value	18,644,092	24,211,086
NAIC, Class 2 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	14,909,260	17,023,157
Fair value	12,739,371	14,944,131
NAIC, Class 3 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	554,568	595,193
Fair value	469,819	510,392
NAIC, Class 4 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	116,264	109,409
Fair value	98,929	91,495
NAIC, Class 5 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	61,334	61,721
Fair value	45,253	36,738
NAIC, Class 6 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	10,000	14,636
Fair value	7,127	$ 10,775
Fixed Maturities, Residual Tranche Securities, Not Rated
Debt Securities, Available-for-sale [Line Items]
Amortized cost	58,394
Fair value	$ 80,341
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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