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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, amortized cost $ 1,581,856  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 7,181,216  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 6,387,291  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 10,872,828  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 10,453,431  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 36,476,622  
Fixed maturity securities, available for sale, amortized cost 46,505,721 $ 46,999,183
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, fair value 1,578,652  
Fixed maturity securities, available for sale, due after one year through five years, fair value 6,887,037  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 5,789,381  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 9,794,223  
Fixed maturity securities, available for sale, due after twenty years, fair value 7,916,306  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 31,965,599  
Fixed maturity securities, available for sale, fair value 41,087,911 $ 51,305,943
Residential Mortgage Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 1,465,458  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,372,741  
Commercial Mortgage Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 4,076,549  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 3,706,960  
Other Asset Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 4,487,092  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value $ 4,042,611