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Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost $ 40,928 $ 39,952    
Gross Unrealized Gains 2,191 4,558    
Gross Unrealized Losses 1,157 112    
Allowance for Credit Losses 17 18 $ 43 $ 40
Estimated Fair Value 41,945 44,380    
Shadow adjustments 1,300 2,200    
Corporate and other bonds        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 22,001 21,444    
Gross Unrealized Gains 1,277 2,755    
Gross Unrealized Losses 486 56    
Allowance for Credit Losses 12 11 27 23
Estimated Fair Value 22,780 24,132    
States, municipalities and political subdivisions        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 10,516 10,358    
Gross Unrealized Gains 862 1,599    
Gross Unrealized Losses 319 14    
Allowance for Credit Losses    
Estimated Fair Value 11,059 11,943    
Residential mortgage-backed        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 2,983 2,893    
Gross Unrealized Gains 25 71    
Gross Unrealized Losses 160 8    
Allowance for Credit Losses    
Estimated Fair Value 2,848 2,956    
Commercial mortgage-backed        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 2,008 1,987    
Gross Unrealized Gains 13 63    
Gross Unrealized Losses 81 19    
Allowance for Credit Losses    
Estimated Fair Value 1,940 2,031    
Other asset-backed        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 2,710 2,561    
Gross Unrealized Gains 11 54    
Gross Unrealized Losses 93 10    
Allowance for Credit Losses 5 7    
Estimated Fair Value 2,623 2,598    
Asset-backed        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 7,701 7,441    
Gross Unrealized Gains 49 188    
Gross Unrealized Losses 334 37    
Allowance for Credit Losses 5 7 $ 16 $ 17
Estimated Fair Value 7,411 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 125 132    
Gross Unrealized Gains 1    
Gross Unrealized Losses 5 3    
Allowance for Credit Losses    
Estimated Fair Value 120 130    
Foreign government        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 559 570    
Gross Unrealized Gains 3 15    
Gross Unrealized Losses 13 2    
Allowance for Credit Losses    
Estimated Fair Value 549 583    
Fixed maturities available-for-sale        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 40,922 39,945    
Gross Unrealized Gains 2,191 4,558    
Gross Unrealized Losses 1,157 112    
Allowance for Credit Losses 17 18    
Estimated Fair Value 41,939 44,373    
Fixed maturities trading        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or Amortized Cost 6 7    
Gross Unrealized Gains    
Gross Unrealized Losses      
Allowance for Credit Losses    
Estimated Fair Value $ 6 $ 7