LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Ending balance	$ 248	$ 402
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance at original discount rate	357
Ending balance at original discount rate	218
Ending balance	933	1,512
Net liability for future policy benefits	16,033		$ 15,935
Less: Reinsurance recoverable					$ 2,209
Net liability for future policy benefits, after reinsurance recoverable					6,252
Term
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	1,365		1,359
Term | Protection Solutions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Less: Reinsurance recoverable					372
Net liability for future policy benefits, after reinsurance recoverable					$ 1,602
Term | Protection Solutions | Operating Segments
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	2,090	2,472
Beginning balance at original discount rate	2,068	1,853
Effect of changes in cash flow assumptions			8	$ 0
Effect of actual variances from expected experience			4	55
Adjusted beginning of year balance			2,080	1,908
Issuances	15	22
Interest accrual	25	24
Net premiums collected	(51)	(49)
Ending balance at original discount rate	2,069	1,905
Effect of changes in discount rate assumptions	81	385
Ending balance	2,150	2,290
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	3,449	4,274
Beginning balance at original discount rate	3,376	3,225
Effect of changes in cash flow assumptions			9	0
Effect of actual variances from expected experience			5	60
Adjusted beginning of period balance			3,390	3,285
Issuances	16	23
Interest accrual	42	41
Benefits payments	95	135
Ending balance at original discount rate	3,353	3,214
Effect of changes in discount rate assumptions	162	646
Ending balance	3,515	3,860
Net liability for future policy benefits	1,365	1,570
Less: Reinsurance recoverable	(206)	(244)
Net liability for future policy benefits, after reinsurance recoverable	$ 1,159	$ 1,326
Weighted-average duration of liability for future policyholder benefits (years)	7 years 1 month 6 days	7 years 6 months
Payout - Non-Legacy
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	$ 853		828
Payout - Non-Legacy | Individual Retirement | Operating Segments
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	0
Beginning balance at original discount rate	0
Effect of changes in cash flow assumptions			0
Effect of actual variances from expected experience			0
Adjusted beginning of year balance			0
Issuances	0
Interest accrual	0
Net premiums collected	0
Ending balance at original discount rate	0
Effect of changes in discount rate assumptions	0
Ending balance	0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance at original discount rate	845	$ 883
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			0	(1)
Adjusted beginning of period balance			845	882
Issuances		9
Interest accrual		10
Benefits payments		23
Ending balance at original discount rate	846	878
Effect of changes in discount rate assumptions		126
Ending balance	852	1,004
Net liability for future policy benefits		1,004
Less: Reinsurance recoverable		0
Net liability for future policy benefits, after reinsurance recoverable		$ 1,004
Weighted-average duration of liability for future policyholder benefits (years)		9 years 7 months 6 days
Payout - Non-Legacy | GMxB Legacy | Operating Segments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	828	$ 1,114
Issuances	14
Interest accrual	10
Benefits payments	23
Effect of changes in discount rate assumptions	6
Net liability for future policy benefits	853
Less: Reinsurance recoverable	0
Net liability for future policy benefits, after reinsurance recoverable	$ 853
Payout - Non-Legacy | Non Legacy | Operating Segments
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance		0
Beginning balance at original discount rate		0
Effect of changes in cash flow assumptions				0
Effect of actual variances from expected experience				0
Adjusted beginning of year balance				0
Issuances		0
Interest accrual		0
Net premiums collected		0
Ending balance at original discount rate		0
Effect of changes in discount rate assumptions		0
Ending balance		0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Weighted-average duration of liability for future policyholder benefits (years)	9 years 4 months 24 days
Payout-Legacy
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	$ 2,945		2,689
Payout-Legacy | Individual Retirement | Operating Segments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	2,689
Issuances	222
Interest accrual	21
Benefits payments	65
Effect of changes in discount rate assumptions	(257)
Net liability for future policy benefits	2,945
Less: Reinsurance recoverable	(589)
Payout-Legacy | GMxB Legacy | Operating Segments
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	0	0
Beginning 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 year balance			0	0
Issuances	0	0
Interest accrual	0	0
Net premiums collected	0	0
Ending balance at original discount rate	0	0
Effect of changes in discount rate assumptions	0	0
Ending balance	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance		2,547
Beginning balance at original discount rate	3,024	2,400
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			1	(4)
Adjusted beginning of period balance			3,025	2,396
Issuances		152
Interest accrual		16
Benefits payments		47
Ending balance at original discount rate	3,203	2,517
Effect of changes in discount rate assumptions		(58)
Ending balance	2,946	2,459
Net liability for future policy benefits		2,459
Less: Reinsurance recoverable		(203)
Net liability for future policy benefits, after reinsurance recoverable	$ 2,356	$ 2,256
Weighted-average duration of liability for future policyholder benefits (years)	7 years 10 months 24 days	8 years 4 months 24 days
Group Pension
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	$ 522		523
Group Pension | Corporate and Other
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	0	$ 0
Beginning 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 year balance			0	0
Issuances	0	0
Interest accrual	0	0
Net premiums collected	0	0
Ending balance at original discount rate	0	0
Effect of changes in discount rate assumptions	0	0
Ending balance	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	523	683
Beginning balance at original discount rate	583	632
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(1)	0
Adjusted beginning of period balance			582	632
Issuances	0	0
Interest accrual	5	6
Benefits payments	17	18
Ending balance at original discount rate	570	620
Effect of changes in discount rate assumptions	(48)	1
Ending balance	522	621
Net liability for future policy benefits	522	621
Less: Reinsurance recoverable	0	0
Net liability for future policy benefits, after reinsurance recoverable	$ 522	$ 621
Weighted-average duration of liability for future policyholder benefits (years)	7 years 1 month 6 days	7 years 2 months 12 days
Health
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	$ 1,584		1,560
Health | Corporate and Other
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	(6)	$ 22
Beginning balance at original discount rate	(6)	19
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(6)	(18)
Adjusted beginning of year balance			(12)	1
Issuances	0	0
Interest accrual	0	0
Net premiums collected	1	0
Ending balance at original discount rate	(11)	1
Effect of changes in discount rate assumptions	0	1
Ending balance	(11)	2
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	1,554	2,092
Beginning balance at original discount rate	1,795	1,915
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(7)	(20)
Adjusted beginning of period balance			1,788	1,895
Issuances	0	0
Interest accrual	15	15
Benefits payments	33	41
Ending balance at original discount rate	1,770	1,869
Effect of changes in discount rate assumptions	(198)	(5)
Ending balance	1,572	1,864
Net liability for future policy benefits	1,584	1,862
Less: Reinsurance recoverable	(1,258)	(1,479)
Net liability for future policy benefits, after reinsurance recoverable	$ 326	$ 383
Weighted-average duration of liability for future policyholder benefits (years)	8 years 8 months 12 days	8 years 10 months 24 days
UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	$ 43
Net liability for future policy benefits	1,141		1,119
UL | Protection Solutions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	1,120	$ 1,082
Beginning balance at original discount rate	1,135	1,076
Effect of changes in cash flow assumptions	1,154	1,090
Effect of actual variances from expected experience			6	5
Adjusted beginning of period balance			$ 1,141	$ 1,086
Interest accrual	13	12
Benefits payments	(18)	(29)
Ending balance	1,142	1,089
Net liability for future policy benefits	1,142	1,089
Less: Reinsurance recoverable	(573)	(552)
Net liability for future policy benefits, after reinsurance recoverable	$ 569	$ 537
Weighted-average duration of liability for future policyholder benefits (years)	21 years 7 months 6 days	22 years 10 months 24 days