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Investments (Summary of fixed maturity and equity securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Fixed maturity securities available-for-sale:            
Gross Unrealized Gains $ 1,017   $ 4,558      
Gross Unrealized Losses 2,842   112      
Allowance for Credit Losses 5 $ 17 18 $ 45 $ 43 $ 40
Estimated Fair Value 39,385   44,373      
Total fixed maturity securities trading            
Debt securities, amortized cost 41,215   39,952      
Total fixed maturity securities 39,385   44,380      
Corporate and other bonds            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 22,606   21,444      
Gross Unrealized Gains 499   2,755      
Gross Unrealized Losses 1,440   56      
Allowance for Credit Losses 0 12 11 24 27 23
Estimated Fair Value 21,665   24,132      
Total fixed maturity securities trading            
Total fixed maturity securities 22,325   24,852      
States, municipalities and political subdivisions            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 9,822   10,358      
Gross Unrealized Gains 492   1,599      
Gross Unrealized Losses 676   14      
Allowance for Credit Losses 0   0      
Estimated Fair Value 9,638   11,943      
Total fixed maturity securities trading            
Total fixed maturity securities 9,638   11,943      
Asset-backed            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 8,092   7,441      
Gross Unrealized Gains 24   188      
Gross Unrealized Losses 689   37      
Allowance for Credit Losses 5 $ 5 7 $ 21 $ 16 $ 17
Estimated Fair Value 7,422   7,585      
Total fixed maturity securities trading            
Total fixed maturity securities 7,422   7,585      
Residential mortgage-backed            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 3,034   2,893      
Gross Unrealized Gains 14   71      
Gross Unrealized Losses 305   8      
Allowance for Credit Losses 0   0      
Estimated Fair Value 2,743   2,956      
Commercial mortgage-backed            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 1,995   1,987      
Gross Unrealized Gains 6   63      
Gross Unrealized Losses 164   19      
Allowance for Credit Losses 0   0      
Estimated Fair Value 1,837   2,031      
Other asset-backed            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 3,063   2,561      
Gross Unrealized Gains 4   54      
Gross Unrealized Losses 220   10      
Allowance for Credit Losses 5   7      
Estimated Fair Value 2,842   2,598      
Fixed maturity securities            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 41,215   39,945      
Gross Unrealized Gains 1,017   4,558      
Gross Unrealized Losses 2,842   112      
Allowance for Credit Losses 5   18      
Estimated Fair Value 39,385   44,373      
U.S. Treasury and obligations of government-sponsored enterprises            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 115   132      
Gross Unrealized Gains 1   1      
Gross Unrealized Losses 7   3      
Allowance for Credit Losses 0   0      
Estimated Fair Value 109   130      
Foreign government            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 577   570      
Gross Unrealized Gains 1   15      
Gross Unrealized Losses 30   2      
Allowance for Credit Losses 0   0      
Estimated Fair Value 548   583      
Redeemable preferred stock            
Fixed maturity securities available-for-sale:            
Cost or Amortized Cost 3   0      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses 0   0      
Allowance for Credit Losses 0   0      
Estimated Fair Value 3   0      
Total fixed maturity securities trading            
Total fixed maturity securities trading            
Cost or amortized cost, trading securities 0   7      
Estimated fair value, trading securities $ 0   $ 7