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Investments - Debt Securities by Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Amortized Cost    
Less than one year $ 961  
One year through five years 10,984  
After five years through ten years 4,534  
Greater than ten years 2,754  
Amortized Cost 26,656 $ 26,562
Fair Value    
Less than one year 963  
One year through five years 11,070  
After five years through ten years 4,564  
Greater than ten years 2,561  
Fair Value 26,554 26,033
Residential mortgage-backed securities    
Amortized Cost    
Debt securities, maturity, without single maturity date 837  
Amortized Cost 837 792
Fair Value    
Debt securities, maturity, without single maturity date 803  
Fair Value 803 740
Commercial mortgage-backed securities    
Amortized Cost    
Debt securities, maturity, without single maturity date 1,780  
Amortized Cost 1,780 1,731
Fair Value    
Debt securities, maturity, without single maturity date 1,761  
Fair Value 1,761 1,673
Other asset-backed securities    
Amortized Cost    
Debt securities, maturity, without single maturity date 4,806  
Amortized Cost 4,806 4,834
Fair Value    
Debt securities, maturity, without single maturity date 4,832  
Fair Value $ 4,832 $ 4,862