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INVESTMENT OPERATIONS - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
unrealized_loss_position
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Available-for-sale securities      
Continuous unrealized loss position, 12 months or longer $ (75,941) $ (239,860)  
Minimum percentage of underlying collateral guaranteed by third party 97.00%    
Number of positions in unrealized loss position | unrealized_loss_position 429    
Number of positions in unrealized loss position with allowance established | unrealized_loss_position 7    
Fixed maturity securities - AFS $ 69,763,824 64,746,076  
Available-for-sale securities, amortized cost 62,880,477 61,970,744  
Securities in trading portfolio 2,958,145 2,625,436  
Non-income producing investments 28,300 155,100  
Policy loans $ 1,593,394 1,675,121  
Interest rate on collateral loans on life insurance policies (as a percent) 13.64%    
Total fixed maturity securities - available-for-sale      
Available-for-sale securities      
Fixed maturity securities - AFS $ 69,377,559 63,516,425  
Available-for-sale securities, amortized cost 62,494,212 60,741,093  
Securities in trading portfolio 2,862,368 2,527,567  
Gross unrealized holding gains   201,909  
Gross unrecognized holding losses   0  
Credit losses on held-to-maturity securities   0 $ 0
Commercial mortgage-backed securities      
Available-for-sale securities      
Continuous unrealized loss position, 12 months or longer (4,084) (1,571)  
Fixed maturity securities - AFS 2,506,784 2,639,668  
Available-for-sale securities, amortized cost 2,403,218 2,588,575  
Securities in trading portfolio 214,107 201,284  
Other asset-backed securities      
Available-for-sale securities      
Continuous unrealized loss position, 12 months or longer (4,794) (8,410)  
Fixed maturity securities - AFS 1,578,456 1,781,235  
Available-for-sale securities, amortized cost 1,546,204 1,764,120  
Securities in trading portfolio 162,641 143,361  
Corporate securities      
Available-for-sale securities      
Continuous unrealized loss position, 12 months or longer (66,124) (220,045)  
Unrealized losses, greater than twelve months, credit related 17,700    
Impairment recognized due to decline in value of oil and gas securities 125,500    
Fixed maturity securities - AFS 51,938,753 46,809,101  
Available-for-sale securities, amortized cost 45,997,229 44,493,799  
Securities in trading portfolio $ 1,860,273 $ 1,590,936  
Minimum      
Available-for-sale securities      
Interest rate on standard policy loans (as a percent) 3.00%    
Maximum      
Available-for-sale securities      
Interest rate on standard policy loans (as a percent) 8.00%    
Below investment grade      
Available-for-sale securities      
Fixed maturity securities - AFS $ 2,600,000    
Available-for-sale securities, amortized cost 2,500,000    
Securities in trading portfolio 140,400    
Securities not publicly traded $ 493,200