POLICY LIABILITIES - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Feb. 01, 2021
Present value of expected net premiums
Balance as of beginning of the period	$ (255,401)	$ (329,716)
Balance at original discount rate	(303,610)	(334,780)
Effect of changes in cash flow assumptions			$ 0	$ 0
Effect of actual variances from expected experience			992	5,148
Adjusted beginning of period balance			(302,618)	(329,632)
Interest	(1,206)	(1,180)
Net premiums collected	8,283	9,815
Ending balance at original discount rate	(295,541)	(320,997)
Effect of changes in discount rate assumptions	43,489	20,194
Balance as of the end of the period	(252,052)	(300,803)
Present value of expected future policy benefits
Less: reinsurance recoverable					$ (15,828,738)
Liability for future policy benefit, reinsurance recoverable, after allowance, net of discount rate assumptions	237,100	(814,300)
Payout Annuity And Long-Duration Insurance, Other
Present value of expected future policy benefits
Balance as of beginning of the period	14,701,321	17,186,303
Balance at original discount rate	17,987,181	17,338,775
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(4,238)	(4,339)
Adjusted beginning of period balance			17,982,943	17,334,436
Issuances	559,436	335,337
Interest	96,121	75,842
Benefit payments	(415,287)	(404,744)
De-recognition (lapses and withdrawals)	0	(2,267)
Ending balance at original discount rate	18,223,213	17,338,604
Effect of changes in discount rate assumptions	(2,836,699)	(1,617,492)
Balance as of the end of the period	15,386,514	15,721,112
Total policy liabilities	15,134,462	15,420,309
Less: reinsurance recoverable	(7,634,820)	(7,911,474)
Policy liabilities(3) (including market risk benefits)	7,499,642	7,508,835
Payout annuities
Present value of expected net premiums
Balance as of beginning of the period	0	0
Balance at original discount rate	0	0
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			0	0
Adjusted beginning of period balance			0	0
Interest	0	0
Net premiums collected	0	0
Ending balance at original discount rate	0	0
Effect of changes in discount rate assumptions	0	0
Balance as of the end of the period	0	0
Present value of expected future policy benefits
Balance as of beginning of the period	14,021,514	16,302,904
Balance at original discount rate	17,180,626	16,443,480
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(7,777)	(606)
Adjusted beginning of period balance			17,172,849	16,442,874
Issuances	559,421	332,874
Interest	93,654	71,690
Benefit payments	(389,426)	(376,446)
De-recognition (lapses and withdrawals)	0	0
Ending balance at original discount rate	17,436,498	16,470,992
Effect of changes in discount rate assumptions	(2,721,312)	(1,564,311)
Balance as of the end of the period	14,715,186	14,906,681
Total policy liabilities	14,715,186	14,906,681
Less: reinsurance recoverable	(7,636,570)	(7,906,865)			(7,175,906)
Policy liabilities(3) (including market risk benefits)	7,078,616	6,999,816
Other
Present value of expected net premiums
Balance as of beginning of the period	(255,401)	(329,716)
Balance at original discount rate	(303,610)	(334,780)
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			992	5,148
Adjusted beginning of period balance			(302,618)	(329,632)
Interest	(1,206)	(1,180)
Net premiums collected	8,283	9,815
Ending balance at original discount rate	(295,541)	(320,997)
Effect of changes in discount rate assumptions	43,489	20,194
Balance as of the end of the period	(252,052)	(300,803)
Present value of expected future policy benefits
Balance as of beginning of the period	679,807	883,399
Balance at original discount rate	806,555	895,295
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			3,539	(3,733)
Adjusted beginning of period balance			$ 810,094	$ 891,562
Issuances	15	2,463
Interest	2,467	4,152
Benefit payments	(25,861)	(28,298)
De-recognition (lapses and withdrawals)	0	(2,267)
Ending balance at original discount rate	786,715	867,612
Effect of changes in discount rate assumptions	(115,387)	(53,181)
Balance as of the end of the period	671,328	814,431
Total policy liabilities	419,276	513,628
Less: reinsurance recoverable	1,750	(4,609)			$ (4,164,982)
Policy liabilities(3) (including market risk benefits)	$ 421,026	$ 509,019