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INVESTMENTS - AFS Fixed Maturity Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost $ 78,723,857 $ 73,600,788    
Allowance for Credit Losses (268,712) (128,332) $ (88,133) $ (120,895)
Gross unrealized gains 367,025 73,312    
Gross unrealized losses (9,407,982) (11,606,239)    
Fair value 69,414,188 61,939,529    
Allowance for credit losses at acquisition (12,800) (29,900)    
U.S. government and agencies        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 1,209,507 438,931    
Allowance for Credit Losses 0 0    
Gross unrealized gains 62,514 304    
Gross unrealized losses (68,929) (72,494)    
Fair value 1,203,092 366,741    
U.S. state, municipal and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 5,562,826 5,638,252    
Allowance for Credit Losses 0 0    
Gross unrealized gains 29,699 6,582    
Gross unrealized losses (985,133) (1,233,874)    
Fair value 4,607,392 4,410,960    
Corporate        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 46,378,337 44,253,062    
Allowance for Credit Losses (49,008) (1,298) $ (3,238) $ 0
Gross unrealized gains 211,570 49,509    
Gross unrealized losses (6,592,143) (7,984,341)    
Fair value 39,948,756 36,316,932    
Residential mortgage-backed securities, or “RMBS”        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 8,734,629 7,307,526    
Allowance for Credit Losses (152,067) (100,554)    
Gross unrealized gains 38,206 12,052    
Gross unrealized losses (674,550) (834,212)    
Fair value 7,946,218 6,384,812    
Commercial mortgage-backed securities, or “CMBS”        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 7,491,743 7,269,662    
Allowance for Credit Losses (35,953) (14,490)    
Gross unrealized gains 4,195 36    
Gross unrealized losses (731,358) (834,735)    
Fair value 6,728,627 6,420,473    
Collateralized bond obligations, or “CBOs”        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 2,951,511 3,051,850    
Allowance for Credit Losses (1,214) (426)    
Gross unrealized gains 0 0    
Gross unrealized losses (143,818) (217,773)    
Fair value 2,806,479 2,833,651    
CLOs        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 3,493,731 2,726,888    
Allowance for Credit Losses (19,077) (6,165)    
Gross unrealized gains 6,483 127    
Gross unrealized losses (52,365) (200,160)    
Fair value 3,428,772 2,520,690    
Asset-backed securities, or “ABSs”        
Debt Securities, Available-for-sale [Line Items]        
Cost or amortized cost 2,901,573 2,914,617    
Allowance for Credit Losses (11,393) (5,399)    
Gross unrealized gains 14,358 4,702    
Gross unrealized losses (159,686) (228,650)    
Fair value $ 2,744,852 $ 2,685,270