LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Balances of and Changes in Additional Liabilities Related to Insurance Guarantees (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 Future Policy Benefit [Roll Forward]
Ending balance	$ 933	$ 1,512
Future policy benefits and other policyholders' liabilities	$ 16,033		$ 15,935
Less: Reinsurance recoverable					$ 2,209
Net liability for future policy benefits, after reinsurance recoverable					6,252
Weighted Average Interest Rate	4.50%	4.50%
Liability for future policy benefits - changes in current discount rate (net of deferred income tax expense (benefit) of $248 and $402)	$ 218		357
Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	172	$ 180
Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	13	$ 12
UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	43
Future policy benefits and other policyholders' liabilities	$ 1,141		1,119
Weighted Average Interest Rate	4.50%	4.50%
UL | Protection Solutions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	$ 1,120	$ 1,082
Effect of changes in interest rate & cash flow assumptions and model changes			0	$ 5
Effect of actual variances from expected experience			6	5
Adjusted BOP Balance			1,141	1,086
Interest accrual	13	12
Net assessments collected	18	21
Benefits payments	18	29
Ending balance before shadow reserve adjustments	1,154	1,090
Effect of shadow reserve adjustment	(12)	(1)
Ending balance	1,142	1,089
Future policy benefits and other policyholders' liabilities	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
Liability for future policy benefits - changes in current discount rate (net of deferred income tax expense (benefit) of $248 and $402)			1,135	1,076
UL | Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	$ 172	$ 180
UL | Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	13	12
Payout - Non-Legacy
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits and other policyholders' liabilities	$ 853		$ 828
Weighted Average Interest Rate	4.90%		4.90%
Payout - Non-Legacy | Non Legacy | Operating Segments
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 - Non-Legacy | GMxB Legacy | Operating Segments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	$ 828	1,114
Interest accrual	10
Benefits payments	(23)
Future policy benefits and other policyholders' liabilities	853
Less: Reinsurance recoverable	0
Net liability for future policy benefits, after reinsurance recoverable	853
Issuances	14
Payout - Non-Legacy | Individual Retirement | Operating Segments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance before shadow reserve adjustments	0	0
Effect of actual variances from expected experience			$ 0	(1)
Adjusted BOP Balance			845	882
Interest accrual		10
Benefits payments		(23)
Ending balance	852	1,004
Future policy benefits and other policyholders' liabilities		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
Liability for future policy benefits - changes in current discount rate (net of deferred income tax expense (benefit) of $248 and $402)	846	$ 878	845	883
Issuances		9
Payout-Legacy
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits and other policyholders' liabilities	2,945		2,689
Payout-Legacy | GMxB Legacy | Operating Segments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance		2,547
Beginning balance before shadow reserve adjustments	0	0
Effect of actual variances from expected experience			1	(4)
Adjusted BOP Balance			3,025	2,396
Interest accrual		16
Benefits payments		(47)
Ending balance	2,946	2,459
Future policy benefits and other policyholders' liabilities		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
Liability for future policy benefits - changes in current discount rate (net of deferred income tax expense (benefit) of $248 and $402)	$ 3,203	$ 2,517	3,024	2,400
Issuances		152
Payout-Legacy | Individual Retirement | Operating Segments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	2,689
Interest accrual	21
Benefits payments	(65)
Future policy benefits and other policyholders' liabilities	2,945
Less: Reinsurance recoverable	(589)
Issuances	222
Term
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits and other policyholders' liabilities	$ 1,365		$ 1,359
Weighted Average Interest Rate	5.60%		5.70%
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 Future Policy Benefit [Roll Forward]
Beginning balance	$ 3,449	4,274
Beginning balance before shadow reserve adjustments	9	0
Effect of actual variances from expected experience			$ 5	60
Adjusted BOP Balance			3,390	3,285
Interest accrual	42	41
Benefits payments	(95)	(135)
Ending balance	3,515	3,860
Future policy benefits and other policyholders' liabilities	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
Liability for future policy benefits - changes in current discount rate (net of deferred income tax expense (benefit) of $248 and $402)	$ 3,353	$ 3,214	3,376	3,225
Issuances	16	23
Group Pension
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits and other policyholders' liabilities	$ 522		$ 523
Weighted Average Interest Rate	3.40%		3.40%
Group Pension | Corporate and Other
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	$ 523	683
Beginning balance before shadow reserve adjustments	0	0
Effect of actual variances from expected experience			$ (1)	0
Adjusted BOP Balance			582	632
Interest accrual	5	6
Benefits payments	(17)	(18)
Ending balance	522	621
Future policy benefits and other policyholders' liabilities	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
Liability for future policy benefits - changes in current discount rate (net of deferred income tax expense (benefit) of $248 and $402)	$ 570	$ 620	583	632
Issuances	0	0
Health
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits and other policyholders' liabilities	$ 1,584		$ 1,560
Weighted Average Interest Rate	3.30%		3.30%
Health | Corporate and Other
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	$ 1,554	2,092
Beginning balance before shadow reserve adjustments	0	0
Effect of actual variances from expected experience			$ (7)	(20)
Adjusted BOP Balance			1,788	1,895
Interest accrual	15	15
Benefits payments	(33)	(41)
Ending balance	1,572	1,864
Future policy benefits and other policyholders' liabilities	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
Liability for future policy benefits - changes in current discount rate (net of deferred income tax expense (benefit) of $248 and $402)	$ 1,770	$ 1,869	$ 1,795	$ 1,915
Issuances	$ 0	$ 0