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Investments - Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 538  
Due after one year through five years 2,437  
Due after five years through ten years 406  
Due after ten years 986  
Amortized Cost 4,367 $ 3,709
Estimated Fair Value    
Due in one year or less 530  
Due after one year through five years 2,384  
Due after five years through ten years 405  
Due after ten years 940  
Amortized Cost $ 4,259 $ 3,499