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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 43,323,015	$ 44,866,019
Fair Value	38,680,457	39,804,617	[1]
NAIC, Class 1 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,852,711	27,061,903
Fair Value	24,130,363	24,211,086
NAIC, Class 2 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,733,173	17,023,157
Fair Value	13,925,216	14,944,131
NAIC, Class 3 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	616,104	595,193
Fair Value	518,089	510,392
NAIC, Class 4 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	102,614	109,409
Fair Value	92,058	91,495
NAIC, Class 5 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,765	61,721
Fair Value	6,917	36,738
NAIC, Class 6 Designation
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,648	14,636
Fair Value	$ 7,814	$ 10,775
[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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