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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost $ 46,505,721 $ 46,999,183
Fixed maturity securities, available for sale, fair value 41,087,911 51,305,943
NAIC, Class 1 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 27,008,700 26,157,531
Fixed maturity securities, available for sale, fair value 24,082,858 28,785,839
NAIC, Class 2 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 18,703,067 19,758,594
Fixed maturity securities, available for sale, fair value 16,342,207 21,396,020
NAIC, Class 3 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 625,554 909,311
Fixed maturity securities, available for sale, fair value 533,923 941,210
NAIC, Class 4 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 95,833 133,070
Fixed maturity securities, available for sale, fair value 82,402 147,160
NAIC, Class 5 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 56,835 16,496
Fixed maturity securities, available for sale, fair value 37,389 15,357
NAIC, Class 6 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 15,732 24,181
Fixed maturity securities, available for sale, fair value $ 9,132 $ 20,357