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INVESTMENTS - Available-for-sale Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 73,061   $ 72,991
Allowance for Credit Losses 18   24
Gross Unrealized Gains 198   106
Gross Unrealized Losses 8,176   9,712
Fair Value 65,065   63,361
Amortized Cost (Less Allowance for Credit Losses)      
Due in one year or less 1,551    
Due in years two through five 15,798    
Due in years six through ten 16,462    
Due after ten years 25,858    
Subtotal 59,669    
Amortized cost 73,043    
Fair Value      
Due in one year or less 1,533    
Due in years two through five 15,107    
Due in years six through ten 15,023    
Due after ten years 20,972    
Subtotal 52,635    
Fair Value 65,065   63,361
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments      
Proceeds from sales 825 $ 7,391  
Gross gains on sales 2 29  
Gross losses on sales (26) (364)  
Net (increase) decrease in allowance for credit and intent to sell losses 56 (1)  
Fixed Maturities - Credit Loss Impairments      
Balance, beginning of period 36 44  
Previously recognized impairments on securities that matured, paid, prepaid or sold 3 2  
Recognized impairments on securities impaired to fair value this period 52 0  
Credit losses recognized this period on securities for which credit losses were not previously recognized 3 0  
Additional credit losses this period on securities previously impaired 1 1  
Increases due to passage of time on previously recorded credit losses 0 0  
Accretion of previously recognized impairments due to increases in expected cash flows (for OTTI securities 2019 and prior) 0 0  
Balance, end of period 89 $ 43  
Corporate      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 51,030   50,712
Allowance for Credit Losses 18   24
Gross Unrealized Gains 167   89
Gross Unrealized Losses 6,086   7,206
Fair Value 45,093   43,571
Fair Value      
Fair Value 45,093   43,571
U.S. government, agencies and authorities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 6,991   7,054
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   1
Gross Unrealized Losses 925   1,218
Fair Value 6,069   5,837
Fair Value      
Fair Value 6,069   5,837
States and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 638   609
Allowance for Credit Losses 0   0
Gross Unrealized Gains 12   7
Gross Unrealized Losses 75   89
Fair Value 575   527
Fair Value      
Fair Value 575   527
Foreign governments      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,028   985
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   2
Gross Unrealized Losses 133   151
Fair Value 898   836
Fair Value      
Fair Value 898   836
Residential Mortgage-Backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 930   908
Allowance for Credit Losses 0   0
Gross Unrealized Gains 1   1
Gross Unrealized Losses 84   87
Fair Value 847   822
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 930    
Fair Value      
Without single maturity date 847    
Fair Value 847   822
Asset-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 8,548   8,859
Allowance for Credit Losses 0   0
Gross Unrealized Gains 9   4
Gross Unrealized Losses 315   373
Fair Value 8,242   8,490
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 8,548    
Fair Value      
Without single maturity date 8,242    
Fair Value 8,242   8,490
Commercial mortgage-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 3,856   3,823
Allowance for Credit Losses 0   0
Gross Unrealized Gains 0   0
Gross Unrealized Losses 558   588
Fair Value 3,298   3,235
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 3,856    
Fair Value      
Without single maturity date 3,298    
Fair Value 3,298   3,235
Redeemable Preferred Stock      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 40   41
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   2
Gross Unrealized Losses 0   0
Fair Value 43   43
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 40    
Fair Value      
Without single maturity date 43    
Fair Value $ 43   $ 43