FAIR VALUE MEASUREMENTS - Instruments Not Carried At Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financial liabilities:
Securities Sold Under Agreements to Repurchase	$ 328,286	$ 833,568
Insurance
Financial assets:
Cash and cash equivalents	3,713,382	6,118,231	$ 4,590,032	$ 3,391,934
Restricted cash and cash equivalents	277,398	308,383	$ 523,503	$ 300,404
Financial liabilities:
Funds withheld payable at interest	826,566	1,059,820
Securities Sold Under Agreements to Repurchase	313,797	805,316
Insurance \| Carrying Value
Financial assets:
Mortgage and other loan receivables	33,924,777	34,303,183
Policy loans	880,029	868,911
FHLB common stock and other investments	165,322	163,289
Funds withheld receivables at interest	2,792,712	2,855,251
Cash and cash equivalents	3,713,382	6,118,231
Restricted cash and cash equivalents	277,398	308,383
Total Assets at Fair Value	41,753,620	44,617,248
Financial liabilities:
Policy liabilities - policyholder account balances	48,966,089	48,403,949
Funds withheld payable at interest	26,053,226	26,227,183
Debt obligations	2,157,283	2,128,166
Securities Sold Under Agreements to Repurchase	313,797	805,316
Total financial liabilities	77,490,395	77,564,614
Insurance \| Fair Value
Financial assets:
Mortgage and other loan receivables	30,972,550	31,256,107
Policy loans	834,716	789,726
FHLB common stock and other investments	165,322	163,289
Funds withheld receivables at interest	2,792,712	2,855,251
Cash and cash equivalents	3,713,382	6,118,231
Restricted cash and cash equivalents	277,398	308,383
Total Assets at Fair Value	38,756,080	41,490,987
Financial liabilities:
Policy liabilities - policyholder account balances	46,620,933	45,711,562
Funds withheld payable at interest	26,053,226	26,227,183
Debt obligations	1,816,578	1,698,526
Securities Sold Under Agreements to Repurchase	313,797	805,316
Total financial liabilities	74,804,534	74,442,587
Level I \| Insurance \| Fair Value
Financial assets:
Mortgage and other loan receivables	0	0
Policy loans	0	0
FHLB common stock and other investments	0	0
Funds withheld receivables at interest	0	0
Cash and cash equivalents	3,713,382	6,118,231
Restricted cash and cash equivalents	277,398	308,383
Total Assets at Fair Value	3,990,780	6,426,614
Financial liabilities:
Policy liabilities - policyholder account balances	0	0
Funds withheld payable at interest	0	0
Debt obligations	0	0
Securities Sold Under Agreements to Repurchase	0	0
Total financial liabilities	0	0
Level II \| Insurance \| Fair Value
Financial assets:
Mortgage and other loan receivables	0	0
Policy loans	0	0
FHLB common stock and other investments	0	0
Funds withheld receivables at interest	2,792,712	2,855,251
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Total Assets at Fair Value	2,792,712	2,855,251
Financial liabilities:
Policy liabilities - policyholder account balances	39,352,603	38,328,025
Funds withheld payable at interest	26,053,226	26,227,183
Debt obligations	0	0
Securities Sold Under Agreements to Repurchase	313,797	805,316
Total financial liabilities	65,719,626	65,360,524
Level III \| Insurance
Financial assets:
Funds withheld receivables at interest	(17,982)
Financial liabilities:
Policy liabilities - policyholder account balances	1,133,779
Funds withheld payable at interest	(3,057,531)
Level III \| Insurance \| Fair Value
Financial assets:
Mortgage and other loan receivables	30,972,550	31,256,107
Policy loans	834,716	789,726
FHLB common stock and other investments	165,322	163,289
Funds withheld receivables at interest	0	0
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Total Assets at Fair Value	31,972,588	32,209,122
Financial liabilities:
Policy liabilities - policyholder account balances	7,268,330	7,383,537
Funds withheld payable at interest	0	0
Debt obligations	1,816,578	1,698,526
Securities Sold Under Agreements to Repurchase	0	0
Total financial liabilities	$ 9,084,908	$ 9,082,063

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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Amount, after effect of reinsurance, of liability for future policy benefit.

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