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Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost $ 41,261 $ 39,952
Gross Unrealized Gains 1,017 4,558
Gross Unrealized Losses 2,842 112
Allowance for Credit Losses 5 18
Estimated Fair Value 39,431 44,380
Shadow adjustments 432 2,200
Corporate and other bonds    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 22,606 21,444
Gross Unrealized Gains 499 2,755
Gross Unrealized Losses 1,440 56
Allowance for Credit Losses 11
Estimated Fair Value 21,665 24,132
States, municipalities and political subdivisions    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 9,822 10,358
Gross Unrealized Gains 492 1,599
Gross Unrealized Losses 676 14
Allowance for Credit Losses
Estimated Fair Value 9,638 11,943
Residential mortgage-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 3,034 2,893
Gross Unrealized Gains 14 71
Gross Unrealized Losses 305 8
Allowance for Credit Losses
Estimated Fair Value 2,743 2,956
Commercial mortgage-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 1,995 1,987
Gross Unrealized Gains 6 63
Gross Unrealized Losses 164 19
Allowance for Credit Losses
Estimated Fair Value 1,837 2,031
Other asset-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
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
Asset-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 8,092 7,441
Gross Unrealized Gains 24 188
Gross Unrealized Losses 689 37
Allowance for Credit Losses 5 7
Estimated Fair Value 7,422 7,585
U.S. Treasury and obligations of government-sponsored enterprises    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 115 132
Gross Unrealized Gains 1 1
Gross Unrealized Losses 7 3
Allowance for Credit Losses
Estimated Fair Value 109 130
Foreign government    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 577 570
Gross Unrealized Gains 1 15
Gross Unrealized Losses 30 2
Allowance for Credit Losses
Estimated Fair Value 548 583
Fixed maturities available-for-sale    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
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
Fixed maturities trading    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 46 7
Gross Unrealized Gains
Gross Unrealized Losses  
Allowance for Credit Losses
Estimated Fair Value 46 $ 7
Redeemable preferred stock    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 3  
Gross Unrealized Gains  
Gross Unrealized Losses  
Allowance for Credit Losses  
Estimated Fair Value $ 3