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INVESTMENTS - Available-for-sale Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 74,340   $ 74,340   $ 72,991
Allowance for Credit Losses 2   2   24
Gross Unrealized Gains 78   78   106
Gross Unrealized Losses 10,946   10,946   9,712
Fair Value 63,470   63,470   63,361
Amortized Cost (Less Allowance for Credit Losses)          
Due in one year or less 1,677   1,677    
Due in years two through five 14,540   14,540    
Due in years six through ten 17,460   17,460    
Due after ten years 24,301   24,301    
Subtotal 57,978   57,978    
Amortized Cost (Less Allowance for Credit Losses) 74,338   74,338    
Fair Value          
Due in one year or less 1,658   1,658    
Due in years two through five 13,675   13,675    
Due in years six through ten 15,411   15,411    
Due after ten years 17,377   17,377    
Subtotal 48,121   48,121    
Fair Value 63,470   63,470   63,361
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments          
Proceeds from sales 2,524 $ 905 5,579 $ 11,640  
Gross gains on sales 1 0 8 44  
Gross losses on sales (348) (62) (417) (653)  
Net (increase) decrease in Allowance for Credit and Intent to Sell losses (1) (243) (64) (246)  
Fixed Maturities - Credit Loss Impairments          
Balance, beginning of period 44 32 36 44  
Previously recognized impairments on securities that matured, paid, prepaid or sold (1) (2) (58) (17)  
Recognized impairments on securities impaired to fair value this period 0 246 52 246  
Credit losses recognized this period on securities for which credit losses were not previously recognized 1 (1) 10 0  
Additional credit losses this period on securities previously impaired 0 5 4 7  
Balance, end of period 44 $ 280 44 $ 280  
Corporate          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 50,800   50,800   50,712
Allowance for Credit Losses 2   2   24
Gross Unrealized Gains 58   58   89
Gross Unrealized Losses 8,082   8,082   7,206
Fair Value 42,774   42,774   43,571
Fair Value          
Fair Value 42,774   42,774   43,571
U.S. government, agencies and authorities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 5,744   5,744   7,054
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 0   0   1
Gross Unrealized Losses 1,573   1,573   1,218
Fair Value 4,171   4,171   5,837
Fair Value          
Fair Value 4,171   4,171   5,837
States and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 615   615   609
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 2   2   7
Gross Unrealized Losses 102   102   89
Fair Value 515   515   527
Fair Value          
Fair Value 515   515   527
Foreign governments          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 821   821   985
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 1   1   2
Gross Unrealized Losses 161   161   151
Fair Value 661   661   836
Fair Value          
Fair Value 661   661   836
Residential mortgage-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 1,791   1,791   908
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 0   0   1
Gross Unrealized Losses 136   136   87
Fair Value 1,655   1,655   822
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 1,791   1,791    
Fair Value          
Without single maturity date 1,655   1,655    
Fair Value 1,655   1,655   822
Asset-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 10,477   10,477   8,859
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 15   15   4
Gross Unrealized Losses 212   212   373
Fair Value 10,280   10,280   8,490
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 10,477   10,477    
Fair Value          
Without single maturity date 10,280   10,280    
Fair Value 10,280   10,280   8,490
Commercial mortgage-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 4,051   4,051   3,823
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 680   680   588
Fair Value 3,371   3,371   3,235
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 4,051   4,051    
Fair Value          
Without single maturity date 3,371   3,371    
Fair Value 3,371   3,371   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 2   2   2
Gross Unrealized Losses 0   0   0
Fair Value 43   43   43
Amortized Cost (Less Allowance for Credit Losses)          
Without single maturity date 41   41    
Fair Value          
Without single maturity date 43   43    
Fair Value $ 43   $ 43   $ 43