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Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost $ 41,588 $ 39,952
Gross Unrealized Gains 507 4,558
Gross Unrealized Losses 4,588 112
Allowance for Credit Losses 3 18
Estimated Fair Value 37,504 44,380
Shadow adjustments 41 2,200
Corporate and other bonds    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 23,082 21,444
Gross Unrealized Gains 231 2,755
Gross Unrealized Losses 2,398 56
Allowance for Credit Losses 11
Estimated Fair Value 20,915 24,132
States, municipalities and political subdivisions    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 9,244 10,358
Gross Unrealized Gains 259 1,599
Gross Unrealized Losses 1,080 14
Allowance for Credit Losses
Estimated Fair Value 8,423 11,943
Residential mortgage-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 3,153 2,893
Gross Unrealized Gains 6 71
Gross Unrealized Losses 470 8
Allowance for Credit Losses
Estimated Fair Value 2,689 2,956
Commercial mortgage-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 1,921 1,987
Gross Unrealized Gains 4 63
Gross Unrealized Losses 237 19
Allowance for Credit Losses
Estimated Fair Value 1,688 2,031
Other asset-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 3,264 2,561
Gross Unrealized Gains 2 54
Gross Unrealized Losses 349 10
Allowance for Credit Losses 3 7
Estimated Fair Value 2,914 2,598
Asset-backed    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 8,338 7,441
Gross Unrealized Gains 12 188
Gross Unrealized Losses 1,056 37
Allowance for Credit Losses 3 7
Estimated Fair Value 7,291 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 107 132
Gross Unrealized Gains 3 1
Gross Unrealized Losses 1 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 544 570
Gross Unrealized Gains 2 15
Gross Unrealized Losses 48 2
Allowance for Credit Losses
Estimated Fair Value 498 583
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  
Fixed maturities available-for-sale    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 41,318 39,945
Gross Unrealized Gains 507 4,558
Gross Unrealized Losses 4,583 112
Allowance for Credit Losses 3 18
Estimated Fair Value 37,239 44,373
Fixed maturities trading    
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]    
Cost or Amortized Cost 270 7
Gross Unrealized Gains
Gross Unrealized Losses 5  
Allowance for Credit Losses
Estimated Fair Value $ 265 $ 7