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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] $ 49,364,915 $ 46,999,183    
Fixed maturity securities, available for sale, gross unrealized gains 1,671,507 4,421,976    
Fixed maturity securities, available for sale, gross unrealized losses [2] (1,367,725) (112,370)    
Fixed maturity securities, available for sale, allowance for credit losses (6,577) (2,846) $ (59,698) $ (64,771)
Fixed maturity securities, available for sale, fair value 49,662,120 51,305,943    
Accrued interest receivable 440,500 400,700    
United States Government Full Faith and Credit        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 39,302 37,109    
Fixed maturity securities, available for sale, gross unrealized gains 88 718    
Fixed maturity securities, available for sale, gross unrealized losses [2] (724) (34)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Fixed maturity securities, available for sale, fair value 38,666 37,793    
United States Government Sponsored Agencies        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 158,596 1,008,920    
Fixed maturity securities, available for sale, gross unrealized gains 18,473 32,123    
Fixed maturity securities, available for sale, gross unrealized losses [2] (2,224) (90)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Fixed maturity securities, available for sale, fair value 174,845 1,040,953    
United States Municipalities, States and Territories        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 3,694,146 3,495,563    
Fixed maturity securities, available for sale, gross unrealized gains 214,986 437,456    
Fixed maturity securities, available for sale, gross unrealized losses [2] (94,613) (3,042)    
Fixed maturity securities, available for sale, allowance for credit losses (2,009) (2,776) (2,791) (2,844)
Fixed maturity securities, available for sale, fair value 3,812,510 3,927,201    
Foreign Government Obligations        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 415,227 380,646    
Fixed maturity securities, available for sale, gross unrealized gains 11,175 22,742    
Fixed maturity securities, available for sale, gross unrealized losses [2] (21,236) (843)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Fixed maturity securities, available for sale, fair value 405,166 402,545    
Corporate Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 33,550,018 31,084,629    
Fixed maturity securities, available for sale, gross unrealized gains 1,311,404 3,614,047    
Fixed maturity securities, available for sale, gross unrealized losses [2] (984,070) (38,442)    
Fixed maturity securities, available for sale, allowance for credit losses (3,825) 0 (55,715) (60,193)
Fixed maturity securities, available for sale, fair value 33,873,527 34,660,234    
Residential Mortgage Backed Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 1,195,436 1,056,778    
Fixed maturity securities, available for sale, gross unrealized gains 38,688 70,434    
Fixed maturity securities, available for sale, gross unrealized losses [2] (22,822) (2,093)    
Fixed maturity securities, available for sale, allowance for credit losses (743) (70) (1,192) (1,734)
Fixed maturity securities, available for sale, fair value 1,210,559 1,125,049    
Commercial Mortgage Backed Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 4,873,980 4,708,878    
Fixed maturity securities, available for sale, gross unrealized gains 23,338 149,152    
Fixed maturity securities, available for sale, gross unrealized losses [2] (127,451) (17,719)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0 0 0
Fixed maturity securities, available for sale, fair value 4,769,867 4,840,311    
Other Asset Backed Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost [1] 5,438,210 5,226,660    
Fixed maturity securities, available for sale, gross unrealized gains 53,355 95,304    
Fixed maturity securities, available for sale, gross unrealized losses [2] (114,585) (50,107)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0 $ 0 $ 0
Fixed maturity securities, available for sale, fair value $ 5,376,980 $ 5,271,857    
[1] Amortized cost excludes accrued interest receivable of $440.5 million and $400.7 million as of March 31, 2022 and December 31, 2021, respectively.
[2] Gross unrealized losses are net of allowance for credit losses.