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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 38,537,462	$ 44,866,019
Fair value	34,780,482	39,804,617	[1]
NAIC, Class 1 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	22,493,843	27,061,903
Fair value	20,209,842	24,211,086
NAIC, Class 2 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	14,910,687	17,023,157
Fair value	13,529,169	14,944,131
NAIC, Class 3 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	583,131	595,193
Fair value	527,556	510,392
NAIC, Class 4 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	201,610	109,409
Fair value	168,191	91,495
NAIC, Class 5 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	88,581	61,721
Fair value	68,538	36,738
NAIC, Class 6 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	9,400	14,636
Fair value	10,132	10,775
Fixed Maturities, NAIC Rated Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	38,287,252	44,866,019
Fair value	34,513,428	$ 39,804,617
Fixed Maturities, Residual Tranche Securities, Not Rated
Debt Securities, Available-for-sale [Line Items]
Amortized cost	250,210
Fair value	$ 267,054
[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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