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Investments - Debt Securities by Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Net Amortized Cost    
Less than one year $ 1,228  
One year through five years 7,165  
After five years through ten years 5,128  
Greater than ten years 4,375  
Net Amortized Cost 22,796 $ 22,174
Fair Value    
Less than one year 1,235  
One year through five years 7,038  
After five years through ten years 4,965  
Greater than ten years 4,515  
Total 22,498 23,240
Residential mortgage-backed securities    
Net Amortized Cost    
Debt securities, maturity, without single maturity date 910  
Net Amortized Cost 910 870
Fair Value    
Debt securities, maturity, without single maturity date 867  
Total 867 875
Commercial mortgage-backed securities    
Net Amortized Cost    
Debt securities, maturity, without single maturity date 1,284  
Net Amortized Cost 1,284 1,278
Fair Value    
Debt securities, maturity, without single maturity date 1,225  
Total 1,225 1,310
Other asset-backed securities    
Net Amortized Cost    
Debt securities, maturity, without single maturity date 2,706  
Net Amortized Cost 2,706 2,791
Fair Value    
Debt securities, maturity, without single maturity date 2,653  
Total $ 2,653 $ 2,792