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INVESTMENT OPERATIONS - Additional Information (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
position
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months $ 503,298 $ 239,860
Total positions that were in an unrealized loss position | position 2,450  
Fixed maturity securities - available-for-sale $ 62,402,703 64,749,076
Available-for-sale, amortized cost 62,470,798 61,970,744
Fixed maturity securities - trading 2,531,538 2,625,436
Below investment grade    
Schedule of Investments [Line Items]    
Fixed maturity securities - available-for-sale 1,500,000  
Available-for-sale, amortized cost 2,000,000  
Fixed maturity securities - trading 113,700  
Securities not publicly traded 196,200  
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 773 2,091
Fixed maturity securities - available-for-sale 6,930,540 5,931,341
Available-for-sale, amortized cost 6,979,230 5,812,170
Fixed maturity securities - trading 197,722 209,521
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 1,568 1,571
Fixed maturity securities - available-for-sale 2,506,050 2,639,668
Available-for-sale, amortized cost 2,527,869 2,588,575
Fixed maturity securities - trading 181,870 201,284
Other asset-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 43,734 8,410
Unrealized losses, greater than twelve months, credit related 700  
Fixed maturity securities - available-for-sale 1,655,038 1,781,235
Available-for-sale, amortized cost 1,726,799 1,764,120
Fixed maturity securities - trading 134,311 143,361
U.S. government-related securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 36 1,943
Fixed maturity securities - available-for-sale 1,030,256 1,032,396
Available-for-sale, amortized cost 1,000,140 1,032,048
Fixed maturity securities - trading 45,072 47,067
Other government-related securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 2,314 1,322
Fixed maturity securities - available-for-sale 579,401 597,169
Available-for-sale, amortized cost 565,785 548,136
Fixed maturity securities - trading 27,596 28,775
States, municipals, and political subdivisions    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 78 229
Fixed maturity securities - available-for-sale 4,563,619 4,638,850
Available-for-sale, amortized cost 4,301,818 4,415,008
Fixed maturity securities - trading 284,213 293,791
Corporate securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 450,137 220,045
Unrealized losses, greater than twelve months, credit related 51,100  
Fixed maturity securities - available-for-sale 44,127,935 46,809,101
Available-for-sale, amortized cost 44,352,067 44,493,799
Fixed maturity securities - trading 1,552,707 1,590,936
Fixed maturities    
Schedule of Investments [Line Items]    
Fixed maturity securities - available-for-sale 61,472,737 63,519,425
Available-for-sale, amortized cost 61,540,832 60,741,093
Fixed maturity securities - trading 2,433,506 2,527,567
Gross unrecognized holding gains 155,027 201,909
Gross unrecognized holding losses $ 0 $ 0