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INVESTMENTS - AFS Fixed Maturity Securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	$ 68,937,475	$ 69,519,496
Allowance for Credit Losses	(102,293)	(88,133)	$ (96,908)	$ (91,646)	$ (140,252)	$ (120,895)
Gross unrealized gains	63,549	413,373
Gross unrealized losses	(9,124,132)	(973,850)
Fair value	59,774,599	68,870,886
Allowance for credit losses at acquisition	(41,000)	(46,400)
U.S. government and agencies
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	508,496	785,144
Allowance for Credit Losses	0	0
Gross unrealized gains	113	4,171
Gross unrealized losses	(53,904)	(4,768)
Fair value	454,705	784,547
U.S. state, municipal and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	5,267,311	5,122,651
Allowance for Credit Losses	0	0
Gross unrealized gains	2,469	42,286
Gross unrealized losses	(926,378)	(55,240)
Fair value	4,343,402	5,109,697
Corporate
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	39,719,567	41,433,757
Allowance for Credit Losses	(7,842)	(3,238)	$ (5,000)	$ 0	$ 0	$ 0
Gross unrealized gains	24,969	190,516
Gross unrealized losses	(6,604,273)	(688,648)
Fair value	33,132,421	40,932,387
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	7,528,128	7,703,030
Allowance for Credit Losses	(71,206)	(50,975)
Gross unrealized gains	27,223	126,662
Gross unrealized losses	(504,820)	(113,359)
Fair value	6,979,325	7,665,358
Commercial mortgage-backed securities ("CMBS")
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	7,295,229	5,952,656
Allowance for Credit Losses	(7,577)	(282)
Gross unrealized gains	2,479	16,332
Gross unrealized losses	(578,734)	(56,523)
Fair value	6,711,397	5,912,183
Collateralized bond obligations ("CBOs")
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	3,085,670	3,111,620
Allowance for Credit Losses	(34)	(22,160)
Gross unrealized gains	0	6,862
Gross unrealized losses	(156,330)	(27,466)
Fair value	2,929,306	3,068,856
CLOs
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	2,693,875	2,985,098
Allowance for Credit Losses	(6,729)	(639)
Gross unrealized gains	32	6,554
Gross unrealized losses	(146,429)	(5,776)
Fair value	2,540,749	2,985,237
All other structured securities
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	2,839,199	2,425,540
Allowance for Credit Losses	(8,905)	(10,839)
Gross unrealized gains	6,264	19,990
Gross unrealized losses	(153,264)	(22,070)
Fair value	$ 2,683,294	$ 2,412,621