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Investment Information - Summary of available for sale securities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 16,768,363 $ 18,717,825
Estimated Fair Value 3,069,965 1,924,922
Estimated Fair Value 19,838,328 20,921,530
Gross Unrealized Gains 255,815 657,620
Gross Unrealized Losses (115,117) (79,654)
Allowance for expected credit losses (2,111) (2,397)
Amortized cost 16,629,621 18,143,305
Cost 3,070,120 1,924,292
Cost or Amortized Cost $ 19,699,741 20,345,961
Accounting Standards Update Accounting Standards Update 2016-13 [Member]  
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value [1] $ 16,768,363 18,996,608
Gross Unrealized Gains [1] 254,190 654,927
Gross Unrealized Losses [1] (113,337) (77,591)
Allowance for expected credit losses [2] (2,111) [1] (2,397)
Amortized cost [1] 16,629,621 18,421,669
Fixed maturities | Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 6,403,617 7,856,571
Gross Unrealized Gains [1] 155,246 414,247
Gross Unrealized Losses [1] (40,649) (34,388)
Allowance for expected credit losses [2] (1,440) [1] (896)
Amortized cost [1] 6,290,460 7,477,608
Fixed maturities | Mortgage backed securities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 405,797 630,001
Gross Unrealized Gains [1] 3,384 8,939
Gross Unrealized Losses [1] (3,966) (5,028)
Allowance for expected credit losses [2] (24) [1] (278)
Amortized cost [1] 406,403 626,368
Fixed maturities | Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 382,722 494,522
Gross Unrealized Gains [1] 20,096 27,291
Gross Unrealized Losses [1] (1,206) (3,835)
Allowance for expected credit losses [2] (2) [1] (11)
Amortized cost [1] 363,834 471,077
Fixed maturities | Commercial mortgage backed securities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 579,424 389,900
Gross Unrealized Gains [1] 3,598 8,722
Gross Unrealized Losses [1] (548) (2,954)
Allowance for expected credit losses [2] (3) [1] (122)
Amortized cost [1] 576,377 384,254
Fixed maturities | US government and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 4,460,515 5,557,077
Gross Unrealized Gains [1] 12,912 22,612
Gross Unrealized Losses [1] (30,320) (12,611)
Allowance for expected credit losses [2] 0 [1] 0
Amortized cost [1] 4,477,923 5,547,076
Fixed maturities | Non-US government securities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 1,863,734 2,433,733
Gross Unrealized Gains [1] 46,378 153,891
Gross Unrealized Losses [1] (28,948) (8,060)
Allowance for expected credit losses [2] (82) [1] 0
Amortized cost [1] 1,846,386 2,287,902
Fixed maturities | Asset backed securities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,672,554 1,634,804
Gross Unrealized Gains [1] 12,576 19,225
Gross Unrealized Losses [1] (7,700) (10,715)
Allowance for expected credit losses [2] (560) [1] (1,090)
Amortized cost [1] 2,668,238 1,627,384
Short-term investments    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 3,069,965 1,924,922
Gross Unrealized Gains 1,625 2,693
Gross Unrealized Losses (1,780) (2,063)
Allowance for expected credit losses [2] 0 0
Cost $ 3,070,120 $ 1,924,292
[1] In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities pledged. For purposes of this table, the Company has excluded the collateral received under securities lending, at fair value and included the securities pledged under securities lending, at fair value. See “—Securities Lending Agreements.” In September 2021, the Company terminated its securities lending program and no longer enters into securities lending agreements with financial institutions.
[2] Effective January 1, 2020, the Company adopted ASU 2016-13 and as a result any credit impairment losses on the Company’s available-for-sale investments are recorded as an allowance, subject to reversal.