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INVESTMENTS - Available-for-sale Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 73,994   $ 73,994   $ 72,991
Allowance for Credit Losses 2   2   24
Gross Unrealized Gains 147   147   106
Gross Unrealized Losses 8,788   8,788   9,712
Fair Value 65,351   65,351   63,361
Amortized Cost (Less Allowance for Credit Losses)          
Due in one year or less 1,510   1,510    
Due in years two through five 14,339   14,339    
Due in years six through ten 17,371   17,371    
Due after ten years 25,712   25,712    
Subtotal 58,932   58,932    
Amortized cost 73,992   73,992    
Fair Value          
Due in one year or less 1,491   1,491    
Due in years two through five 13,546   13,546    
Due in years six through ten 15,778   15,778    
Due after ten years 20,444   20,444    
Subtotal 51,259   51,259    
Fair Value 65,351   65,351   63,361
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments          
Proceeds from sales 2,230 $ 3,344 3,055 $ 10,735  
Gross gains on sales 5 15 7 44  
Debt Securities, Available For Sale Securities, Gross Realized Losses Cost Basis Methodology Of Securities Sold (43) (227) (69) (591)  
Gross losses on sales 7 (2) 63 (3)  
Fixed Maturities - Credit Loss Impairments          
Balance, beginning of period 89 43 36 44  
Previously recognized impairments on securities that matured, paid, prepaid or sold 54 13 57 15  
Recognized impairments on securities impaired to fair value this period 0 0 52 0  
Credit losses recognized this period on securities for which credit losses were not previously recognized 6 1 9 1  
Additional credit losses this period on securities previously impaired 3 1 4 2  
Increases due to passage of time on previously recorded credit losses 0 0 0 0  
Accretion of previously recognized impairments due to increases in expected cash flows (for OTTI securities 2019 and prior) 0 0 0 0  
Balance, end of period 44 $ 32 44 $ 32  
Corporate          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 50,420   50,420   50,712
Allowance for Credit Losses 2   2   24
Gross Unrealized Gains 121   121   89
Gross Unrealized Losses 6,496   6,496   7,206
Fair Value 44,043   44,043   43,571
Fair Value          
Fair Value 44,043   44,043   43,571
U.S. government, agencies and authorities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 6,998   6,998   7,054
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 1   1   1
Gross Unrealized Losses 1,104   1,104   1,218
Fair Value 5,895   5,895   5,837
Fair Value          
Fair Value 5,895   5,895   5,837
States and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 622   622   609
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 9   9   7
Gross Unrealized Losses 78   78   89
Fair Value 553   553   527
Fair Value          
Fair Value 553   553   527
Foreign governments          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 894   894   985
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 3   3   2
Gross Unrealized Losses 129   129   151
Fair Value 768   768   836
Fair Value          
Fair Value 768   768   836
Residential Mortgage-Backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 1,389   1,389   908
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 1   1   1
Gross Unrealized Losses 100   100   87
Fair Value 1,290   1,290   822
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 1,389   1,389    
Fair Value          
Without single maturity date 1,290   1,290    
Fair Value 1,290   1,290   822
Asset-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 9,741   9,741   8,859
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 9   9   4
Gross Unrealized Losses 281   281   373
Fair Value 9,469   9,469   8,490
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 9,741   9,741    
Fair Value          
Without single maturity date 9,469   9,469    
Fair Value 9,469   9,469   8,490
Commercial mortgage-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 3,889   3,889   3,823
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 600   600   588
Fair Value 3,289   3,289   3,235
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 3,889   3,889    
Fair Value          
Without single maturity date 3,289   3,289    
Fair Value 3,289   3,289   3,235
Redeemable Preferred Stock          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 41   41   41
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 3   3   2
Gross Unrealized Losses 0   0   0
Fair Value 44   44   43
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 41   41    
Fair Value          
Without single maturity date 44   44    
Fair Value $ 44   $ 44   $ 43