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INVESTMENTS - Available-for-sale Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 85,230   $ 84,717
Allowance for Credit Losses 7   2
Gross Unrealized Gains 499   373
Gross Unrealized Losses 7,725   8,447
Fair Value 77,997   76,641
Amortized Cost (Less Allowance for Credit Losses)      
Due in one year or less 2,652    
Due in years two through five 15,365    
Due in years six through ten 19,282    
Due after ten years 24,205    
Subtotal 61,504    
Amortized Cost (Less Allowance for Credit Losses) 85,223    
Fair Value      
Due in one year or less 2,634    
Due in years two through five 15,068    
Due in years six through ten 18,502    
Due after ten years 18,435    
Subtotal 54,639    
Fair Value 77,997   76,641
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments      
Proceeds from sales 1,302 $ 444  
Gross gains on sales 2 0  
Gross losses on sales (3) (24)  
Net (increase) decrease in Allowance for Credit and Intent to Sell losses (6) (2)  
Fixed Maturities - Credit Loss Impairments      
Balance, beginning of period 47 48  
Previously recognized impairments on securities that matured, paid, prepaid or sold 0 (4)  
Recognized impairments on securities impaired to fair value this period 0 0  
Credit losses recognized this period on securities for which credit losses were not previously recognized 5 3  
Additional credit losses this period on securities previously impaired 1 1  
Balance, end of period 53 $ 48  
Corporate      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 54,248   55,218
Allowance for Credit Losses 7   2
Gross Unrealized Gains 336   251
Gross Unrealized Losses 5,640   6,116
Fair Value 48,937   49,351
Fair Value      
Fair Value 48,937   49,351
U.S. government, agencies and authorities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 6,110   5,801
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   0
Gross Unrealized Losses 1,359   1,513
Fair Value 4,754   4,288
Fair Value      
Fair Value 4,754   4,288
States and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 469   472
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   2
Gross Unrealized Losses 83   88
Fair Value 389   386
Fair Value      
Fair Value 389   386
Foreign governments      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 684   689
Allowance for Credit Losses 0   0
Gross Unrealized Gains 1   1
Gross Unrealized Losses 126   136
Fair Value 559   554
Fair Value      
Fair Value 559   554
Residential mortgage-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 5,323   4,520
Allowance for Credit Losses 0   0
Gross Unrealized Gains 53   15
Gross Unrealized Losses 116   152
Fair Value 5,260   4,383
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 5,323    
Fair Value      
Without single maturity date 5,260    
Fair Value 5,260   4,383
Asset-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 13,857   13,660
Allowance for Credit Losses 0   0
Gross Unrealized Gains 91   96
Gross Unrealized Losses 63   57
Fair Value 13,885   13,699
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 13,857    
Fair Value      
Without single maturity date 13,885    
Fair Value 13,885   13,699
Commercial mortgage-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 4,485   4,301
Allowance for Credit Losses 0   0
Gross Unrealized Gains 9   5
Gross Unrealized Losses 338   385
Fair Value 4,156   3,921
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 4,485    
Fair Value      
Without single maturity date 4,156    
Fair Value 4,156   3,921
Redeemable preferred stock      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 54   56
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   3
Gross Unrealized Losses 0   0
Fair Value 57   59
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 54    
Fair Value      
Without single maturity date 57    
Fair Value $ 57   $ 59