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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Estimated Fair Value    
Estimated Fair Value $ 23,136 $ 21,015
Amortized Cost    
Cost or Amortized Cost 24,440 22,615
Fixed maturities    
Estimated Fair Value    
Due in one year or less 576 511
Due after one year through five years 12,033 11,016
Due after five years through 10 years 4,449 3,984
Due after 10 years 31 403
Single maturity date 17,089 15,914
Estimated Fair Value 21,434 19,683
Amortized Cost    
Due in one year or less 603 537
Due after one year through five years 12,606 11,715
Due after five years through 10 years 4,889 4,527
Due after 10 years 65 480
Single maturity date 18,163 17,259
Cost or Amortized Cost 22,739 21,282
Fixed maturities | Residential mortgage backed securities    
Estimated Fair Value    
Securities without single maturity date 860 795
Estimated Fair Value 860 795
Amortized Cost    
Securities without single maturity date 944 877
Cost or Amortized Cost 944 877
Fixed maturities | Commercial mortgage backed securities    
Estimated Fair Value    
Securities without single maturity date 1,082 1,047
Estimated Fair Value 1,082 1,047
Amortized Cost    
Securities without single maturity date 1,133 1,107
Cost or Amortized Cost 1,133 1,107
Fixed maturities | Asset backed securities    
Estimated Fair Value    
Securities without single maturity date 2,403 1,927
Estimated Fair Value 2,403 1,927
Amortized Cost    
Securities without single maturity date 2,499 2,039
Cost or Amortized Cost $ 2,499 $ 2,039