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FAIR VALUE OF ASSETS AND LIABILITIES - Quantitative Information Regarding Internally-Prices Level 3 Assets and Liabilities (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
ASSETS    
Fixed maturity securities $ 5,210 $ 5,024
Deposit asset 438 607
Net modified coinsurance receivable   18
LIABILITIES    
Insurance liabilities 5,003 5,546
Net modified coinsurance payable 78  
Retained Business    
ASSETS    
Net modified coinsurance receivable   0
LIABILITIES    
Insurance liabilities 2,835 2,941
Net modified coinsurance payable 0  
Ceded Business    
ASSETS    
Net modified coinsurance receivable   18
LIABILITIES    
Insurance liabilities 2,168 $ 2,605
Net modified coinsurance payable 78  
U.S. corporate private securities | Retained Business    
LIABILITIES    
Security owned not readily marketable, fair value 41  
U.S. corporate private securities | Ceded Business    
LIABILITIES    
Security owned not readily marketable, fair value 1  
Foreign corporate private securities | Retained Business    
LIABILITIES    
Security owned not readily marketable, fair value 20  
Foreign corporate private securities | Ceded Business    
LIABILITIES    
Security owned not readily marketable, fair value 1  
Asset-backed securities | Retained Business    
LIABILITIES    
Security owned not readily marketable, fair value 26  
Residential mortgage loans | Retained Business    
LIABILITIES    
Security owned not readily marketable, fair value 5  
Short term investments | Ceded Business    
LIABILITIES    
Security owned not readily marketable, fair value $ 4  
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Retained Business | Measurement Input, Equality Volatility Curve    
LIABILITIES    
Insurance Liability, Measurement Input 0.15 0.195
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Retained Business | Measurement Input, Lapse Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.0065 0.01
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Retained Business | Measurement Input, Spread Over Risk Free    
LIABILITIES    
Insurance Liability, Measurement Input 0.0000 0.0000
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Retained Business | Measurement Input, Utilization Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.875 0.925
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Retained Business | Measurement Input, Mortality Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0 0
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Ceded Business | Measurement Input, Equality Volatility Curve    
LIABILITIES    
Insurance Liability, Measurement Input 0.15 0.195
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Ceded Business | Measurement Input, Lapse Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.0065 0.01
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Ceded Business | Measurement Input, Spread Over Risk Free    
LIABILITIES    
Insurance Liability, Measurement Input 0.0000 0.0000
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Ceded Business | Measurement Input, Utilization Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.875 0.925
Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Ceded Business | Measurement Input, Mortality Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0 0
Valuation Technique, Discounted cash flow | Minimum     | U.S. corporate private securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0519 0.0475
Valuation Technique, Discounted cash flow | Minimum     | Foreign corporate private securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0465 0.0433
Valuation Technique, Discounted cash flow | Minimum     | Asset-backed securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0637 0.0719
Valuation Technique, Discounted cash flow | Minimum     | Commercial mortgage loans | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Loans receivable, measurement input 0.0587  
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Retained Business | Measurement Input, Equality Volatility Curve    
LIABILITIES    
Insurance Liability, Measurement Input 0.25 0.26
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Retained Business | Measurement Input, Lapse Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.13 0.20
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Retained Business | Measurement Input, Spread Over Risk Free    
LIABILITIES    
Insurance Liability, Measurement Input 0.0194 0.0243
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Retained Business | Measurement Input, Utilization Rate    
LIABILITIES    
Insurance Liability, Measurement Input 1 1
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Retained Business | Measurement Input, Mortality Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.16 0.16
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Ceded Business | Measurement Input, Equality Volatility Curve    
LIABILITIES    
Insurance Liability, Measurement Input 0.25 0.26
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Ceded Business | Measurement Input, Lapse Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.13 0.20
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Ceded Business | Measurement Input, Spread Over Risk Free    
LIABILITIES    
Insurance Liability, Measurement Input 0.0173 0.0221
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Ceded Business | Measurement Input, Utilization Rate    
LIABILITIES    
Insurance Liability, Measurement Input 1 1
Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Ceded Business | Measurement Input, Mortality Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.16 0.16
Valuation Technique, Discounted cash flow | Maximum     | U.S. corporate private securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0936 0.0803
Valuation Technique, Discounted cash flow | Maximum     | Foreign corporate private securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0678 0.0638
Valuation Technique, Discounted cash flow | Maximum     | Asset-backed securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.1217 0.0851
Valuation Technique, Discounted cash flow | Maximum     | Commercial mortgage loans | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Loans receivable, measurement input 0.0715  
Valuation Technique, Discounted cash flow | Weighted Average | U.S. corporate private securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0693 0.0656
Valuation Technique, Discounted cash flow | Weighted Average | Foreign corporate private securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0572 0.0536
Valuation Technique, Discounted cash flow | Weighted Average | Asset-backed securities | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Fixed maturity securities, measurement input 0.0796 0.0794
Valuation Technique, Discounted cash flow | Weighted Average | Commercial mortgage loans | Level 3 | Retained Business | Measurement Input, Discount Rate    
ASSETS    
Loans receivable, measurement input 0.0672  
Valuation Technique, Level yield | Minimum     | Residential mortgage loans | Level 3 | Retained Business | Measurement Input, Market Yield    
ASSETS    
Loans receivable, measurement input 0.0643 5.75
Valuation Technique, Level yield | Maximum     | Residential mortgage loans | Level 3 | Retained Business | Measurement Input, Market Yield    
ASSETS    
Loans receivable, measurement input 0.1161 9.97
Valuation Technique, Level yield | Weighted Average | Residential mortgage loans | Level 3 | Retained Business | Measurement Input, Market Yield    
ASSETS    
Loans receivable, measurement input 0.0794 8.40
Recurring    
ASSETS    
Fixed maturity securities $ 5,202 $ 5,024
Mortgage loans 437 196
Deposit asset 438 607
LIABILITIES    
Insurance liabilities 5,003 5,546
Net modified coinsurance payable 78  
Recurring | Retained Business    
ASSETS    
Fixed maturity securities 4,150 3,616
Mortgage loans 437 196
LIABILITIES    
Insurance liabilities 2,835 2,941
Recurring | Ceded Business    
ASSETS    
Fixed maturity securities 1,052 1,408
Deposit asset 438 607
LIABILITIES    
Insurance liabilities 2,168 2,605
Net modified coinsurance payable 78  
Recurring | Level 3    
ASSETS    
Fixed maturity securities 553 337
Mortgage loans 437 196
Deposit asset 438 607
LIABILITIES    
Insurance liabilities 5,003 5,546
Net modified coinsurance payable 78  
Recurring | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities 551 337
Mortgage loans 437 196
LIABILITIES    
Insurance liabilities 2,835 2,941
Recurring | Level 3 | Ceded Business    
ASSETS    
Fixed maturity securities 2 0
Deposit asset 438 607
Net modified coinsurance receivable   18
LIABILITIES    
Insurance liabilities 2,168 2,605
Net modified coinsurance payable 78  
Recurring | Foreign corporate private securities    
ASSETS    
Fixed maturity securities 88 67
Recurring | Foreign corporate private securities | Retained Business    
ASSETS    
Fixed maturity securities 56 36
Recurring | Foreign corporate private securities | Ceded Business    
ASSETS    
Fixed maturity securities 32 31
Recurring | Foreign corporate private securities | Level 3    
ASSETS    
Fixed maturity securities 57 36
Recurring | Foreign corporate private securities | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities 56 36
Recurring | Foreign corporate private securities | Level 3 | Ceded Business    
ASSETS    
Fixed maturity securities 1 0
Recurring | Asset-backed securities    
ASSETS    
Fixed maturity securities 952 532
Recurring | Asset-backed securities | Retained Business    
ASSETS    
Fixed maturity securities 952 513
Recurring | Asset-backed securities | Ceded Business    
ASSETS    
Fixed maturity securities   19
Recurring | Asset-backed securities | Level 3    
ASSETS    
Fixed maturity securities 246 155
Recurring | Asset-backed securities | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities 246 155
Recurring | Asset-backed securities | Level 3 | Ceded Business    
ASSETS    
Fixed maturity securities   0
Recurring | Asset-backed securities | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities 220 155
Recurring | Commercial mortgage loans    
ASSETS    
Fixed maturity securities 12 43
Recurring | Commercial mortgage loans | Retained Business    
ASSETS    
Fixed maturity securities 12 43
Recurring | Commercial mortgage loans | Level 3    
ASSETS    
Fixed maturity securities 0 0
Recurring | Commercial mortgage loans | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities 0 0
Recurring | Reinsurance recoverables | Level 3 | Ceded Business    
ASSETS    
Reinsurance recoverables 206 235
Recurring | Policyholders' account balances | Level 3    
LIABILITIES    
Net modified coinsurance payable 78  
Recurring | Valuation Technique, Discounted cash flow | Level 3 | Retained Business    
LIABILITIES    
Insurance liabilities 2,835 2,941
Recurring | Valuation Technique, Discounted cash flow | Level 3 | Ceded Business    
LIABILITIES    
Insurance liabilities 2,168 2,605
Recurring | Valuation Technique, Discounted cash flow | U.S. corporate private securities | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities 203 146
Recurring | Valuation Technique, Discounted cash flow | Foreign corporate private securities | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities 36 36
Recurring | Valuation Technique, Discounted cash flow | Asset-backed securities | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities $ 107  
Recurring | Valuation Technique, Discounted cash flow | Minimum     | Level 3 | Measurement Input, Withdrawal Rate    
LIABILITIES    
Insurance Liability, Measurement Input 0.88  
Recurring | Valuation Technique, Discounted cash flow | Maximum     | Level 3 | Measurement Input, Withdrawal Rate    
LIABILITIES    
Insurance Liability, Measurement Input 1  
Recurring | Valuation, Trade price | Asset-backed securities | Level 3 | Retained Business    
ASSETS    
Fixed maturity securities $ 113  
Recurring | Valuation, Trade price | Commercial mortgage loans | Level 3 | Retained Business    
ASSETS    
Mortgage loans 76 35
Recurring | Valuation Technique, Level yield | Residential mortgage loans | Level 3 | Retained Business    
ASSETS    
Mortgage loans $ 361 $ 161