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INVESTMENTS - AFS Fixed Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost $ 68,223,171    
Allowance for Credit Losses (96,400) $ (91,646) $ (120,895)
Gross unrealized gains 450,033    
Gross unrealized losses (886,958)    
Fair value 67,689,846    
U.S. government and agencies      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 1,030,859    
Allowance for Credit Losses 0    
Gross unrealized gains 14    
Gross unrealized losses (11,860)    
Fair value 1,019,013    
U.S. state, municipal and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 5,136,682    
Allowance for Credit Losses 0    
Gross unrealized gains 29,493    
Gross unrealized losses (61,090)    
Fair value 5,105,085    
Corporate      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 41,280,338    
Allowance for Credit Losses 0 $ 0 $ 0
Gross unrealized gains 205,390    
Gross unrealized losses (689,688)    
Fair value 40,796,040    
RMBS      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 8,074,429    
Allowance for Credit Losses (71,565)    
Gross unrealized gains 146,277    
Gross unrealized losses (70,457)    
Fair value 8,078,684    
CMBS      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 3,981,119    
Allowance for Credit Losses 0    
Gross unrealized gains 28,830    
Gross unrealized losses (16,578)    
Fair value 3,993,371    
CBOs      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 3,171,138    
Allowance for Credit Losses (17,187)    
Gross unrealized gains 9,711    
Gross unrealized losses (17,132)    
Fair value 3,146,530    
CLOs      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 3,024,860    
Allowance for Credit Losses (665)    
Gross unrealized gains 8,845    
Gross unrealized losses (2,468)    
Fair value 3,030,572    
All other structured securities      
Debt Securities, Available-for-sale [Line Items]      
Cost or amortized cost 2,523,746    
Allowance for Credit Losses (6,983)    
Gross unrealized gains 21,473    
Gross unrealized losses (17,685)    
Fair value $ 2,520,551