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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
[2]
Jan. 01, 2020
[2]
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost $ 47,132,615 [1]     $ 48,238,946
Fixed maturity securities, available for sale, gross unrealized gains 5,373,658     3,633,599
Fixed maturity securities, available for sale, gross unrealized losses (743,911)     (292,055)
Fixed maturity securities, available for sale, allowance for credit losses (61,619) $ (50,186) $ 0  
Fixed maturity securities, available for sale, fair value 51,700,743     51,580,490
United States Government Full Faith and Credit        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 36,251 [1]     161,492
Fixed maturity securities, available for sale, gross unrealized gains 2,488     369
Fixed maturity securities, available for sale, gross unrealized losses 0     (96)
Fixed maturity securities, available for sale, allowance for credit losses 0      
Fixed maturity securities, available for sale, fair value 38,739     161,765
United States Government Sponsored Agencies        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 1,024,434 [1]     601,672
Fixed maturity securities, available for sale, gross unrealized gains 51,216     28,133
Fixed maturity securities, available for sale, gross unrealized losses (672)     (4,785)
Fixed maturity securities, available for sale, allowance for credit losses 0      
Fixed maturity securities, available for sale, fair value 1,074,978     625,020
United States Municipalities, States and Territories        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 3,265,276 [1]     4,147,343
Fixed maturity securities, available for sale, gross unrealized gains 545,676     388,578
Fixed maturity securities, available for sale, gross unrealized losses (5,866)     (8,250)
Fixed maturity securities, available for sale, allowance for credit losses 0      
Fixed maturity securities, available for sale, fair value 3,805,086     4,527,671
Foreign Government Obligations        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 187,036 [1]     186,993
Fixed maturity securities, available for sale, gross unrealized gains 22,605     18,103
Fixed maturity securities, available for sale, gross unrealized losses (408)     0
Fixed maturity securities, available for sale, allowance for credit losses 0      
Fixed maturity securities, available for sale, fair value 209,233     205,096
Corporate Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 29,367,052 [1]     29,822,172
Fixed maturity securities, available for sale, gross unrealized gains 4,324,910     2,796,926
Fixed maturity securities, available for sale, gross unrealized losses (181,627)     (82,259)
Fixed maturity securities, available for sale, allowance for credit losses (53,045) (46,749) 0  
Fixed maturity securities, available for sale, fair value 33,457,290     32,536,839
Residential Mortgage Backed Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 1,503,212 [1]     1,477,738
Fixed maturity securities, available for sale, gross unrealized gains 124,849     101,617
Fixed maturity securities, available for sale, gross unrealized losses (3,767)     (3,691)
Fixed maturity securities, available for sale, allowance for credit losses (1,221) (777) 0  
Fixed maturity securities, available for sale, fair value 1,623,073     1,575,664
Commercial Mortgage Backed Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 5,498,757 [1]     5,591,167
Fixed maturity securities, available for sale, gross unrealized gains 190,102     208,895
Fixed maturity securities, available for sale, gross unrealized losses (202,723)     (13,783)
Fixed maturity securities, available for sale, allowance for credit losses (7,353) (2,660) 0  
Fixed maturity securities, available for sale, fair value 5,478,783     5,786,279
Other Asset Backed Securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 6,250,597 [1]     6,250,369
Fixed maturity securities, available for sale, gross unrealized gains 111,812     90,978
Fixed maturity securities, available for sale, gross unrealized losses (348,848)     (179,191)
Fixed maturity securities, available for sale, allowance for credit losses 0 $ 0 $ 0  
Fixed maturity securities, available for sale, fair value 6,013,561     $ 6,162,156
Fixed Maturity Securities, Available For Sale        
Debt Securities, Available-for-sale [Line Items]        
Accrued interest receivable $ 434,300      
[1] (1) Amortized cost excludes accrued interest receivable of $434.3 million as of September 30, 2020.
[2] (1) The allowance for credit loss associated with available for sale fixed maturity securities was applied prospectively upon adoption of authoritative guidance effective January 1, 2020. See Note 1 for further details.