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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 36,009,821	$ 38,537,462
Fair value	32,044,379	34,780,482
Fixed Maturities, NAIC Rated Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	35,791,759	38,287,252
Fair value	31,850,067	34,513,428
NAIC, Class 1 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	21,333,429	22,493,843
Fair value	18,916,331	20,209,842
NAIC, Class 2 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	13,523,795	14,910,687
Fair value	12,096,461	13,529,169
NAIC, Class 3 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	657,003	583,131
Fair value	613,090	527,556
NAIC, Class 4 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	183,294	201,610
Fair value	152,918	168,191
NAIC, Class 5 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	88,840	88,581
Fair value	67,345	68,538
NAIC, Class 6 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized cost	5,398	9,400
Fair value	3,922	10,132
Fixed Maturities, Residual Tranche Securities, Not Rated
Debt Securities, Available-for-sale [Line Items]
Amortized cost	218,062	250,210
Fair value	$ 194,312	$ 267,054

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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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