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INVESTMENTS - Available-for-sale Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 66,277   $ 66,277   $ 59,278
Allowance for Credit Losses 13   13   0
Gross Unrealized Gains 8,747   8,747   3,465
Gross Unrealized Losses 197   197   381
Fair Value     74,814   74,814   62,362
Amortized Cost          
Due in one year or less, Amortized Cost 4,094   4,094    
Due in years two through five, Amortized Cost 14,862   14,862    
Due in years six through ten, Amortized Cost 16,872   16,872    
Due after ten years, Amortized Cost 26,240   26,240    
Subtotal 62,068   62,068    
Amortized cost 66,264   66,264    
Fair Value          
Due in one year or less, Fair Value 4,126   4,126    
Due in years two through five, Fair Value 15,722   15,722    
Due in years six through ten, Fair Value 18,691   18,691    
Due after ten years, Fair Value 31,981   31,981    
Subtotal 70,520   70,520    
Fair Value 74,814   74,814    
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]          
Proceeds from sales 1,399 $ 3,839 5,985 $ 6,756  
Gross gains on sales 23 207 297 224  
Gross losses on sales (5) (4) (32) (25)  
Credit losses 0 0 (13) 0  
Fixed Maturities - Credit Loss Impairments          
Balances, beginning of period 28 18 15 46  
Previously recognized impairments on securities that matured, paid, prepaid or sold 0 (3) 0 (31)  
Recognized impairments on securities impaired to fair value this period 0 0 0 0  
Credit losses recognized this period on securities for which credit losses were not previously recognized (2) 0 7 0  
Additional credit losses this period on securities previously impaired 2 0 6 0  
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 0 0 0 0  
Balances, ending of period 28 $ 15 28 $ 15  
Corporate          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 47,421   47,421   42,347
Allowance for Credit Losses 13   13   0
Gross Unrealized Gains 4,281   4,281   2,178
Gross Unrealized Losses 170   170   61
Fair Value     51,519   51,519   44,464
U.S. Treasury, government and agency          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 13,126   13,126   14,385
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 4,158   4,158   1,151
Gross Unrealized Losses 0   0   305
Fair Value     17,284   17,284   15,231
States and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 706   706   584
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 109   109   68
Gross Unrealized Losses 0   0   3
Fair Value     815   815   649
Foreign governments          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 828   828   460
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 80   80   35
Gross Unrealized Losses 6   6   5
Fair Value     902   902   490
Residential mortgage-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 132   132   161
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 13   13   12
Gross Unrealized Losses 0   0   0
Fair Value     145   145   173
Amortized Cost          
Amortized Cost Basis, without Single Maturity Date 132   132    
Fair Value          
Without single maturity date 145   145    
Asset-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 2,584   2,584   843
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 25   25   3
Gross Unrealized Losses 18   18   2
Fair Value     2,591   2,591   844
Amortized Cost          
Amortized Cost Basis, without Single Maturity Date 2,584   2,584    
Fair Value          
Without single maturity date 2,591   2,591    
Commercial mortgage-backed          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 1,067   1,067    
Allowance for Credit Losses 0   0    
Gross Unrealized Gains 50   50    
Gross Unrealized Losses 0   0    
Fair Value     1,117   1,117    
Amortized Cost          
Amortized Cost Basis, without Single Maturity Date 1,067   1,067    
Fair Value          
Without single maturity date 1,117   1,117    
Redeemable preferred stock          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 413   413   498
Allowance for Credit Losses 0   0   0
Gross Unrealized Gains 31   31   18
Gross Unrealized Losses 3   3   5
Fair Value     441   441   $ 511
Amortized Cost          
Amortized Cost Basis, without Single Maturity Date 413   413    
Fair Value          
Without single maturity date $ 441   $ 441