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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Estimated Fair Value    
Due in one year or less $ 483 $ 511
Due after one year through five years 11,405 11,016
Due after five years through 10 years 4,430 3,984
Due after 10 years 155 403
Single maturity date 16,473 15,914
Estimated Fair Value 22,245 21,015
Amortized Cost    
Due in one year or less 507 537
Due after one year through five years 11,938 11,715
Due after five years through 10 years 4,840 4,527
Due after 10 years 195 480
Single maturity date 17,480 17,259
Cost or Amortized Cost 23,475 22,615
Fixed maturities    
Estimated Fair Value    
Estimated Fair Value 20,692 19,683
Amortized Cost    
Cost or Amortized Cost 21,922 21,282
Residential mortgage backed securities    
Estimated Fair Value    
Securities without single maturity date 823 795
Amortized Cost    
Securities without single maturity date 891 877
Commercial mortgage backed securities    
Estimated Fair Value    
Securities without single maturity date 1,035 1,047
Amortized Cost    
Securities without single maturity date 1,090 1,107
Asset backed securities    
Estimated Fair Value    
Securities without single maturity date 2,361 1,927
Amortized Cost    
Securities without single maturity date $ 2,461 $ 2,039