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INVESTMENTS - AFS Fixed Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	$ 61,148,701
Allowance for Credit Losses	(91,646)	$ (140,252)	$ (120,895)
Gross unrealized gains	387,006
Gross unrealized losses	(644,889)
Fair value	60,799,172
U.S. government and agencies
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	548,294
Allowance for Credit Losses	0
Gross unrealized gains	527
Gross unrealized losses	(5,346)
Fair value	543,475
U.S. state, municipal and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	4,730,159
Allowance for Credit Losses	0
Gross unrealized gains	34,031
Gross unrealized losses	(50,209)
Fair value	4,713,981
Corporate
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	35,534,639
Allowance for Credit Losses	0	$ 0	$ 0
Gross unrealized gains	177,580
Gross unrealized losses	(460,602)
Fair value	35,251,617
RMBS
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	8,298,560
Allowance for Credit Losses	(88,517)
Gross unrealized gains	103,887
Gross unrealized losses	(64,618)
Fair value	8,249,312
CMBS
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	3,745,355
Allowance for Credit Losses	0
Gross unrealized gains	27,639
Gross unrealized losses	(10,148)
Fair value	3,762,846
CBOs
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	3,230,163
Allowance for Credit Losses	(2,555)
Gross unrealized gains	12,913
Gross unrealized losses	(23,943)
Fair value	3,216,578
CLOs
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	2,578,670
Allowance for Credit Losses	(127)
Gross unrealized gains	10,088
Gross unrealized losses	(1,571)
Fair value	2,587,060
All other structured securities
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	2,482,861
Allowance for Credit Losses	(447)
Gross unrealized gains	20,341
Gross unrealized losses	(28,452)
Fair value	$ 2,474,303