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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost $ 46,999,183 $ 42,304,736
Fixed maturity securities, available for sale, fair value 51,305,943 47,538,893
NAIC, Class 1 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 26,157,531 23,330,149
Fixed maturity securities, available for sale, fair value 28,785,839 26,564,542
NAIC, Class 2 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 19,758,594 17,312,485
Fixed maturity securities, available for sale, fair value 21,396,020 19,377,013
NAIC, Class 3 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 909,311 1,292,124
Fixed maturity securities, available for sale, fair value 941,210 1,299,455
NAIC, Class 4 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 133,070 282,049
Fixed maturity securities, available for sale, fair value 147,160 256,651
NAIC, Class 5 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 16,496 29,396
Fixed maturity securities, available for sale, fair value 15,357 16,288
NAIC, Class 6 Designation    
Investment Holdings [Line Items]    
Fixed maturity securities, available for sale, amortized cost 24,181 58,533
Fixed maturity securities, available for sale, fair value $ 20,357 $ 24,944