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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period $ 37,142 $ 26,153 $ 37,352 $ 22,238
Cumulative effect adjustment resulting from changes in accounting principles 44,248 33,278 44,248 33,278
Expected credit losses on securities for which credit losses were not previously recorded 2,305 1,595 2,491 2,079
Expected credit losses (gains) on securities for which credit losses were previously recorded 4,803 5,563 4,412 8,994
Reduction due to disposals (2) (33) (7) (33)
Allowance for expected credit losses, end of period 44,248 33,278 44,248 33,278
Foreign government        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period 33,324 26,153 32,633 22,222
Cumulative effect adjustment resulting from changes in accounting principles 33,052 33,096 33,052 33,096
Expected credit losses on securities for which credit losses were not previously recorded 0 1,413 0 1,897
Expected credit losses (gains) on securities for which credit losses were previously recorded (272) 5,563 419 9,010
Reduction due to disposals 0 (33) 0 (33)
Allowance for expected credit losses, end of period 33,052 33,096 33,052 33,096
Corporate        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period 3,795 0 4,701 16
Cumulative effect adjustment resulting from changes in accounting principles 8,867 182 8,867 182
Expected credit losses on securities for which credit losses were not previously recorded 0 182 186 182
Expected credit losses (gains) on securities for which credit losses were previously recorded 5,074 0 3,987 (16)
Reduction due to disposals (2) 0 (7) 0
Allowance for expected credit losses, end of period 8,867 $ 182 8,867 $ 182
Mortgage-backed        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period 23   18  
Cumulative effect adjustment resulting from changes in accounting principles 885   885  
Expected credit losses on securities for which credit losses were not previously recorded 861   861  
Expected credit losses (gains) on securities for which credit losses were previously recorded 1   6  
Reduction due to disposals 0   0  
Allowance for expected credit losses, end of period 885   885  
Asset-backed        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period 0   0  
Cumulative effect adjustment resulting from changes in accounting principles 1,444   1,444  
Expected credit losses on securities for which credit losses were not previously recorded 1,444   1,444  
Expected credit losses (gains) on securities for which credit losses were previously recorded 0   0  
Reduction due to disposals 0   0  
Allowance for expected credit losses, end of period $ 1,444   $ 1,444