POLICY LIABILITIES - Guaranteed Minimum Interest Rates (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 65,037,432	$ 63,241,065
Percentage of total	100.00%	100.00%
Less than 1.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 30,816,745	$ 28,911,891
Less than 1.00% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	1.00%	1.00%
1.00% - 1.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 9,328,752	$ 9,330,814
1.00% - 1.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	1.00%	1.00%
1.00% - 1.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	1.99%	1.99%
2.00% - 2.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 1,723,196	$ 1,750,744
2.00% - 2.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.00%	2.00%
2.00% - 2.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%	2.99%
3.00% - 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 13,685,616	$ 13,701,250
3.00% - 4.00% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%	3.00%
3.00% - 4.00% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.00%	4.00%
Greater than 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 9,483,123	$ 9,546,366
Greater than 4.00% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.00%	4.00%
At guaranteed minimum
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 25,785,403	$ 26,985,347
Percentage of total	40.00%	43.00%
At guaranteed minimum | Less than 1.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 2,642,851	$ 3,211,064
At guaranteed minimum | 1.00% - 1.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	1,918,437	2,350,348
At guaranteed minimum | 2.00% - 2.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	1,045,214	1,096,383
At guaranteed minimum | 3.00% - 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	12,466,503	12,505,278
At guaranteed minimum | Greater than 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	7,712,398	7,822,274
1 - 49 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 3,395,989	$ 3,264,694
Percentage of total	5.00%	5.00%
1 - 49 bps above guaranteed minimum | Minimum
Policyholder Account Balance [Line Items]
Account values with adjustable crediting rates subject to guaranteed minimums (basis points)	0.0001	0.0001
1 - 49 bps above guaranteed minimum | Maximum
Policyholder Account Balance [Line Items]
Account values with adjustable crediting rates subject to guaranteed minimums (basis points)	0.0049	0.0049
1 - 49 bps above guaranteed minimum | Less than 1.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 24,180	$ 25,500
1 - 49 bps above guaranteed minimum | 1.00% - 1.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	1,236,507	1,171,911
1 - 49 bps above guaranteed minimum | 2.00% - 2.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	49,926	53,360
1 - 49 bps above guaranteed minimum | 3.00% - 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	440,291	417,005
1 - 49 bps above guaranteed minimum | Greater than 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	1,645,085	1,596,918
50 - 99 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 2,121,128	$ 2,148,265
Percentage of total	3.00%	3.00%
50 - 99 bps above guaranteed minimum | Minimum
Policyholder Account Balance [Line Items]
Account values with adjustable crediting rates subject to guaranteed minimums (basis points)	0.0050	0.0050
50 - 99 bps above guaranteed minimum | Maximum
Policyholder Account Balance [Line Items]
Account values with adjustable crediting rates subject to guaranteed minimums (basis points)	0.0099	0.0099
50 - 99 bps above guaranteed minimum | Less than 1.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 830,147	$ 847,989
50 - 99 bps above guaranteed minimum | 1.00% - 1.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	1,067,686	1,077,219
50 - 99 bps above guaranteed minimum | 2.00% - 2.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	10,330	9,747
50 - 99 bps above guaranteed minimum | 3.00% - 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	148,892	147,812
50 - 99 bps above guaranteed minimum | Greater than 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	64,073	65,498
100 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 6,904,840	$ 7,081,979
Percentage of total	11.00%	11.00%
100 - 150 bps above guaranteed minimum | Minimum
Policyholder Account Balance [Line Items]
Account values with adjustable crediting rates subject to guaranteed minimums (basis points)	0.0100	0.0100
100 - 150 bps above guaranteed minimum | Maximum
Policyholder Account Balance [Line Items]
Account values with adjustable crediting rates subject to guaranteed minimums (basis points)	0.0150	0.0150
100 - 150 bps above guaranteed minimum | Less than 1.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 4,508,872	$ 4,669,081
100 - 150 bps above guaranteed minimum | 1.00% - 1.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	1,877,808	1,910,863
100 - 150 bps above guaranteed minimum | 2.00% - 2.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	18,721	1,222
100 - 150 bps above guaranteed minimum | 3.00% - 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	493,461	494,726
100 - 150 bps above guaranteed minimum | Greater than 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	5,978	6,087
Greater than 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 26,830,072	$ 23,760,780
Percentage of total	41.00%	38.00%
Greater than 150 bps above guaranteed minimum | Minimum
Policyholder Account Balance [Line Items]
Account values with adjustable crediting rates subject to guaranteed minimums (basis points)	0.0150	0.0150
Greater than 150 bps above guaranteed minimum | Less than 1.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 22,810,695	$ 20,158,257
Greater than 150 bps above guaranteed minimum | 1.00% - 1.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	3,228,314	2,820,473
Greater than 150 bps above guaranteed minimum | 2.00% - 2.99%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	599,005	590,032
Greater than 150 bps above guaranteed minimum | 3.00% - 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	136,469	136,429
Greater than 150 bps above guaranteed minimum | Greater than 4.00%
Policyholder Account Balance [Line Items]
Account values with adjustable credit rates subject to guaranteed minimum	$ 55,589	$ 55,589