INSURANCE LIABILITIES AND ANNUITY BENEFITS - Schedule of Investment Contracts, Insurance Liabilities and Insurance Annuity Benefits (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefit reserves	$ 36,876	$ 34,593		$ 48,763
Investment contracts	1,667	1,708		1,857
Other	539	544		950
Total	39,082	36,845		51,570
Long-term care
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefit reserves	26,054	24,256	$ 30,314	34,644
Investment contracts	0	0		0
Other	0	0		0
Total	26,054	24,256		34,644
Structured settlement annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefit reserves	9,349	8,860	10,848	12,328
Investment contracts	846	860		950
Other	0	0		0
Total	10,194	9,720		13,278
Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefit reserves	1,045	1,040	$ 1,175	1,301
Investment contracts	0	0		0
Other	178	178		189
Total	1,223	1,218		1,490
Other contracts
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefit reserves	428	437		490
Investment contracts	821	849		907	$ 2,049
Other	361	365		761	564
Total	$ 1,610	$ 1,651		2,158
Claim reserves, short-duration insurance contracts				$ 325	$ 399