FAIR VALUE OF ASSETS AND LIABILITIES - Quantitative Information Regarding Internally-Prices Level 3 Assets and Liabilities (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Assets
Debt securities, available-for-sale	$ 4,966	$ 5,024
Deposit asset	476	607
Net modified coinsurance receivable	0	18
Liabilities:
Insurance liabilities, at fair value	4,984	5,546
Net modified coinsurance payable	81	0
Retained Business
Assets
Net modified coinsurance receivable		0
Liabilities:
Insurance liabilities, at fair value	2,711	2,941
Net modified coinsurance payable	0
Ceded Business
Assets
Net modified coinsurance receivable		18
Liabilities:
Insurance liabilities, at fair value	2,273	$ 2,605
Net modified coinsurance payable	$ 81
Level 3 | Minimum
Liabilities:
Policyholder age	45 years
Level 3 | Minimum | Mortality rate
Liabilities:
Insurance liability, measurement input	0
Level 3 | Maximum
Liabilities:
Policyholder age	90 years
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Equality volatility curve | Retained Business
Liabilities:
Insurance liability, measurement input	0.16	0.195
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Equality volatility curve | Ceded Business
Liabilities:
Insurance liability, measurement input	0.16	0.195
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Lapse rate | Retained Business
Liabilities:
Insurance liability, measurement input	0.01	0.01
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Lapse rate | Ceded Business
Liabilities:
Insurance liability, measurement input	0.01	0.01
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Spread over risk free | Retained Business
Liabilities:
Insurance liability, measurement input	0.0000	0.0000
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Spread over risk free | Ceded Business
Liabilities:
Insurance liability, measurement input	0.0000	0.0000
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Utilization rate | Retained Business
Liabilities:
Insurance liability, measurement input	0.77	0.925
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Utilization rate | Ceded Business
Liabilities:
Insurance liability, measurement input	0.77	0.925
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Mortality rate | Retained Business
Liabilities:
Insurance liability, measurement input	0	0
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Mortality rate | Ceded Business
Liabilities:
Insurance liability, measurement input	0	0
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Corporate Securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0484	0.0475
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Foreign corporate public securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0511	0.0433
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Foreign corporate public securities | Discount rate | Ceded Business
Assets
Debt securities, measurement input	0.0781
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Asset-backed securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0714	0.0719
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Equality volatility curve | Retained Business
Liabilities:
Insurance liability, measurement input	0.25	0.26
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Equality volatility curve | Ceded Business
Liabilities:
Insurance liability, measurement input	0.25	0.26
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Lapse rate | Retained Business
Liabilities:
Insurance liability, measurement input	0.20	0.20
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Lapse rate | Ceded Business
Liabilities:
Insurance liability, measurement input	0.20	0.20
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Spread over risk free | Retained Business
Liabilities:
Insurance liability, measurement input	0.0228	0.0243
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Spread over risk free | Ceded Business
Liabilities:
Insurance liability, measurement input	0.0200	0.0221
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Utilization rate | Retained Business
Liabilities:
Insurance liability, measurement input	1	1
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Utilization rate | Ceded Business
Liabilities:
Insurance liability, measurement input	1	1
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Mortality rate | Retained Business
Liabilities:
Insurance liability, measurement input	0.16	0.16
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Mortality rate | Ceded Business
Liabilities:
Insurance liability, measurement input	0.16	0.16
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Corporate Securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0925	0.0803
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Foreign corporate public securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0716	0.0638
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Foreign corporate public securities | Discount rate | Ceded Business
Assets
Debt securities, measurement input	0.0781
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Asset-backed securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0864	0.0851
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Corporate Securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0695	0.0656
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Foreign corporate public securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0538	0.0536
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Foreign corporate public securities | Discount rate | Ceded Business
Assets
Debt securities, measurement input	0.0781
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Asset-backed securities | Discount rate | Retained Business
Assets
Debt securities, measurement input	0.0804	0.0794
Level 3 | Valuation Technique, Level Yield | Minimum | Residential mortgage loans | Market yield | Retained Business
Assets
Loans receivable, measurement input	0.0705	0.0575
Level 3 | Valuation Technique, Level Yield | Maximum  | Residential mortgage loans | Market yield | Retained Business
Assets
Loans receivable, measurement input	0.0998	0.0997
Level 3 | Valuation Technique, Level Yield | Weighted Average | Residential mortgage loans | Market yield | Retained Business
Assets
Loans receivable, measurement input	0.0854	0.0840
Recurring
Assets
Debt securities, available-for-sale	$ 4,966	$ 5,024
Mortgage and other loans	229	196
Deposit asset	476	607
Liabilities:
Insurance liabilities, at fair value	4,984	5,546
Net modified coinsurance payable	81
Recurring | Retained Business
Assets
Debt securities, available-for-sale	3,749	3,616
Mortgage and other loans	229	196
Liabilities:
Insurance liabilities, at fair value	2,711	2,941
Recurring | Ceded Business
Assets
Debt securities, available-for-sale	1,217	1,408
Deposit asset	476	607
Liabilities:
Insurance liabilities, at fair value	2,273	2,605
Recurring | Foreign corporate public securities
Assets
Debt securities, available-for-sale	195	211
Recurring | Foreign corporate public securities | Retained Business
Assets
Debt securities, available-for-sale	138	122
Recurring | Foreign corporate public securities | Ceded Business
Assets
Debt securities, available-for-sale	57	89
Recurring | Asset-backed securities
Assets
Debt securities, available-for-sale	680	532
Recurring | Asset-backed securities | Retained Business
Assets
Debt securities, available-for-sale	680	513
Recurring | Asset-backed securities | Ceded Business
Assets
Debt securities, available-for-sale		19
Recurring | Commercial mortgage-backed securities
Assets
Debt securities, available-for-sale	17	43
Recurring | Commercial mortgage-backed securities | Retained Business
Assets
Debt securities, available-for-sale	17	43
Recurring | Commercial mortgage-backed securities | Ceded Business
Assets
Debt securities, available-for-sale		0
Recurring | Level 3
Assets
Debt securities, available-for-sale	455	337
Mortgage and other loans	229	196
Deposit asset	476	607
Liabilities:
Insurance liabilities, at fair value	4,984	5,546
Net modified coinsurance payable	81
Recurring | Level 3 | Retained Business
Assets
Debt securities, available-for-sale	452	337
Mortgage and other loans	229	196
Liabilities:
Insurance liabilities, at fair value	2,711	2,941
Recurring | Level 3 | Ceded Business
Assets
Debt securities, available-for-sale	3	0
Deposit asset	476	607
Net modified coinsurance receivable		18
Liabilities:
Insurance liabilities, at fair value	2,273	2,605
Recurring | Level 3 | Corporate Securities | Retained Business
Assets
Debt securities, available-for-sale	210
Recurring | Level 3 | Foreign corporate public securities
Assets
Debt securities, available-for-sale	0	0
Recurring | Level 3 | Foreign corporate public securities | Retained Business
Assets
Debt securities, available-for-sale	0	0
Recurring | Level 3 | Foreign corporate public securities | Ceded Business
Assets
Debt securities, available-for-sale	0	0
Recurring | Level 3 | Asset-backed securities
Assets
Debt securities, available-for-sale	208	155
Recurring | Level 3 | Asset-backed securities | Retained Business
Assets
Debt securities, available-for-sale	208	155
Recurring | Level 3 | Asset-backed securities | Ceded Business
Assets
Debt securities, available-for-sale		0
Recurring | Level 3 | Commercial mortgage-backed securities
Assets
Debt securities, available-for-sale	0	0
Recurring | Level 3 | Commercial mortgage-backed securities | Retained Business
Assets
Debt securities, available-for-sale	0	0
Recurring | Level 3 | Commercial mortgage-backed securities | Ceded Business
Assets
Debt securities, available-for-sale		0
Recurring | Level 3 | Reinsurance recoverables | Ceded Business
Assets
Reinsurance recoverables	200	235
Recurring | Level 3 | Policyholders' account balances
Liabilities:
Net modified coinsurance payable	81
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Retained Business
Liabilities:
Insurance liabilities, at fair value	2,711	2,941
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Ceded Business
Liabilities:
Insurance liabilities, at fair value	2,273	2,605
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Corporate Securities | Retained Business
Assets
Debt securities, available-for-sale	178	146
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Foreign corporate public securities | Retained Business
Assets
Debt securities, available-for-sale	34	36
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Foreign corporate public securities | Ceded Business
Assets
Debt securities, available-for-sale	3
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Asset-backed securities | Retained Business
Assets
Debt securities, available-for-sale	$ 80	$ 155
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Withdrawal Rate
Liabilities:
Insurance liability, measurement input	0.77	0.77
Recurring | Level 3 | Valuation Technique, Discounted Cash Flow | Maximum  | Measurement Input, Withdrawal Rate
Liabilities:
Insurance liability, measurement input	1	1
Recurring | Level 3 | Valuation, market approach | Corporate Securities | Retained Business
Assets
Debt securities, available-for-sale	$ 32
Recurring | Level 3 | Valuation, market approach | Asset-backed securities | Retained Business
Assets
Debt securities, available-for-sale	128
Recurring | Level 3 | Valuation, market approach | Residential mortgage loans | Retained Business
Assets
Mortgage and other loans	20
Recurring | Level 3 | Valuation, market approach | Commercial mortgage-backed securities | Retained Business
Assets
Mortgage and other loans	78	$ 35
Recurring | Level 3 | Valuation Technique, Level Yield | Residential mortgage loans | Retained Business
Assets
Mortgage and other loans	$ 131	$ 161