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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 $ 67,353   $ 68,087
Allowance for Credit Losses 18   24
Gross Unrealized Gains 184   105
Gross Unrealized Losses 7,793   9,221
Fair Value 59,726   58,947
Amortized Cost (Less Allowance for Credit Losses)      
Due in one year or less 1,182    
Due in years two through five 14,080    
Due in years six through ten 14,281    
Due after ten years 24,627    
Subtotal 54,170    
Amortized cost 67,335    
Fair Value      
Due in one year or less 1,170    
Due in years two through five 13,454    
Due in years six through ten 12,986    
Due after ten years 19,875    
Subtotal 47,485    
Fair Value 59,726   58,947
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]      
Proceeds from sales 728 $ 7,336  
Gross gains on sales 2 29  
Gross losses on sales (18) (361)  
Net increase (decrease) in Allowance for Credit and Intent to Sell losses (54) 1  
Fixed Maturities - Credit Loss Impairments      
Balances, beginning of period 36 42  
Previously recognized impairments on securities that matured, paid, prepaid or sold (3) (2)  
Recognized impairments on securities impaired to fair value this period 50 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  
Balances, end of period 87 $ 41  
Corporate      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 45,649   46,053
Allowance for Credit Losses 18   24
Gross Unrealized Gains 154   89
Gross Unrealized Losses 5,636   6,655
Fair Value 40,149   39,463
Fair Value      
Fair Value 40,149   39,463
U.S. government, agencies and authorities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 6,995   7,049
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   1
Gross Unrealized Losses 1,023   1,312
Fair Value 5,975   5,738
Fair Value      
Fair Value 5,975   5,738
States and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 548   540
Allowance for Credit Losses 0   0
Gross Unrealized Gains 12   7
Gross Unrealized Losses 66   76
Fair Value 494   471
Fair Value      
Fair Value 494   471
Foreign governments      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 996   985
Allowance for Credit Losses 0   0
Gross Unrealized Gains 3   2
Gross Unrealized Losses 132   151
Fair Value 867   836
Fair Value      
Fair Value 867   836
Residential mortgage-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 881   860
Allowance for Credit Losses 0   0
Gross Unrealized Gains 1   1
Gross Unrealized Losses 81   84
Fair Value 801   777
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 881    
Fair Value      
Without single maturity date 801    
Fair Value 801   777
Asset-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 8,472   8,817
Allowance for Credit Losses 0   0
Gross Unrealized Gains 8   3
Gross Unrealized Losses 313   371
Fair Value 8,167   8,449
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 8,472    
Fair Value      
Without single maturity date 8,167    
Fair Value 8,167   8,449
Commercial mortgage-backed      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 3,772   3,742
Allowance for Credit Losses 0   0
Gross Unrealized Gains 0   0
Gross Unrealized Losses 542   572
Fair Value 3,230   3,170
Amortized Cost (Less Allowance for Credit Losses)      
Without single maturity date 3,772    
Fair Value      
Without single maturity date 3,230    
Fair Value 3,230   3,170
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