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INVESTMENTS - Available-for-sale Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 75,270   $ 74,033
Allowance for Credit Losses 4   4
Gross Unrealized Gains 337   409
Gross Unrealized Losses 7,997   7,408
Fair Value 67,606   67,030
Amortized Cost (Less Allowance for Credit Losses)      
Due in one year or less 1,898    
Due in years two through five 14,627    
Due in years six through ten 16,210    
Due after ten years 24,292    
Subtotal 57,027    
Amortized Cost (Less Allowance for Credit Losses) 75,266    
Fair Value      
Due in one year or less 1,877    
Due in years two through five 14,108    
Due in years six through ten 15,013    
Due after ten years 18,959    
Subtotal 49,957    
Fair Value 67,606   67,030
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments      
Proceeds from sales 444 $ 825  
Gross gains on sales 0 2  
Gross losses on sales (24) (26)  
Net (increase) decrease in Allowance for Credit and Intent to Sell losses (2) (56)  
Fixed Maturities - Credit Loss Impairments      
Balance, beginning of period 48 36  
Previously recognized impairments on securities that matured, paid, prepaid or sold (4) (3)  
Recognized impairments on securities impaired to fair value this period 0 52  
Credit losses recognized this period on securities for which credit losses were not previously recognized 3 3  
Additional credit losses this period on securities previously impaired 1 1  
Balance, end of period 48 $ 89  
Corporate      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 49,975   49,786
Allowance for Credit Losses 4   4
Gross Unrealized Gains 252   320
Gross Unrealized Losses 5,865   5,360
Fair Value 44,358   44,742
Fair Value      
Fair Value 44,358   44,742
U.S. government, agencies and authorities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 5,759   5,735
Allowance for Credit Losses 0   0
Gross Unrealized Gains 0   2
Gross Unrealized Losses 1,264   1,106
Fair Value 4,495   4,631
Fair Value      
Fair Value 4,495   4,631
States and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 586   614
Allowance for Credit Losses 0   0
Gross Unrealized Gains 6   9
Gross Unrealized Losses 79   74
Fair Value 513   549
Fair Value      
Fair Value 513   549
Foreign governments      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 711   719
Allowance for Credit Losses 0   0
Gross Unrealized Gains 2   3
Gross Unrealized Losses 122   111
Fair Value 591   611
Fair Value      
Fair Value 591   611
Residential mortgage-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 2,678   2,470
Allowance for Credit Losses 0   0
Gross Unrealized Gains 10   18
Gross Unrealized Losses 148   133
Fair Value 2,540   2,355
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 2,678    
Fair Value      
Without single maturity date 2,540    
Fair Value 2,540   2,355
Asset-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 11,852   11,058
Allowance for Credit Losses 0   0
Gross Unrealized Gains 60   52
Gross Unrealized Losses 85   109
Fair Value 11,827   11,001
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 11,852    
Fair Value      
Without single maturity date 11,827    
Fair Value 11,827   11,001
Commercial mortgage-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 3,653   3,595
Allowance for Credit Losses 0   0
Gross Unrealized Gains 4   2
Gross Unrealized Losses 434   515
Fair Value 3,223   3,082
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 3,653    
Fair Value      
Without single maturity date 3,223    
Fair Value 3,223   3,082
Redeemable preferred stock      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 56   56
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   3
Gross Unrealized Losses 0   0
Fair Value 59   59
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 56    
Fair Value      
Without single maturity date 59    
Fair Value $ 59   $ 59