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Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Cost or Amortized Cost    
Cost or Amortized Cost $ 42,037 $ 41,102
Estimated Fair Value    
Estimated Fair Value 38,926 37,697
Available-for-sale Fixed Maturities    
Cost or Amortized Cost    
Due in one year or less 988 1,012
Due after one year through five years 11,072 9,880
Due after five years through ten years 13,445 13,788
Due after ten years 16,333 16,352
Cost or Amortized Cost 41,838 41,032
Estimated Fair Value    
Due in one year or less 972 1,001
Due after one year through five years 10,443 9,399
Due after five years through ten years 12,226 12,453
Due after ten years 15,087 14,774
Estimated Fair Value $ 38,728 $ 37,627