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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 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 $ 1,184,147  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 5,641,072  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 6,254,569  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,853,998  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 10,051,313  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 32,985,099  
Fixed maturity securities, available for sale, amortized cost [1] 44,866,019 $ 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 1,180,124  
Fixed maturity securities, available for sale, due after one year through five years, fair value 5,406,059  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 5,672,730  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 8,817,815  
Fixed maturity securities, available for sale, due after twenty years, fair value 7,754,098  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 28,830,826  
Fixed maturity securities, available for sale 39,804,617 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 1,492,242  
Fixed maturity securities, available for sale, amortized cost [1] 1,492,242 1,056,778
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,377,611  
Fixed maturity securities, available for sale 1,377,611 1,125,049
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 4,098,755  
Fixed maturity securities, available for sale, amortized cost [1] 4,098,755 4,708,878
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 3,687,478  
Fixed maturity securities, available for sale 3,687,478 4,840,311
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 6,289,923  
Fixed maturity securities, available for sale, amortized cost [1] 6,289,923 5,226,660
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 5,908,702  
Fixed maturity securities, available for sale $ 5,908,702 $ 5,271,857
[1] Amortized cost excludes accrued interest receivable of $425.4 million and $400.7 million as of December 31, 2022 and 2021, respectively.