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Investments (Evaluation of Fixed Maturity Securities AFS in an Unrealized Loss Position - Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Change in Gross Unrealized Temporary Loss $ 47,831 $ 8,171 $ (5,198)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 34,300    
Equal to or Greater than 12 Months ,Gross Unrealized Loss $ 10,889 $ 1,154  
Percentage of Gross Unrealized Loss for 12 months or greater 32.00%    
Total number of securities in an unrealized loss position equal or greater than 12 months 4,303 979  
Investment Grade      
Debt Securities, Available-for-sale [Line Items]      
Equal to or Greater than 12 Months ,Gross Unrealized Loss $ 10,298 $ 1,025  
Percentage of Gross Unrealized Loss for 12 months or greater 95.00%    
Total number of securities in an unrealized loss position equal or greater than 12 months 3,875    
Below Investment Grade      
Debt Securities, Available-for-sale [Line Items]      
Equal to or Greater than 12 Months ,Gross Unrealized Loss $ 591 $ 129  
Percentage of Gross Unrealized Loss for 12 months or greater 5.00%    
Total number of securities in an unrealized loss position equal or greater than 12 months 428    
Fixed maturity securities without an allowance for credit loss      
Debt Securities, Available-for-sale [Line Items]      
Change in Gross Unrealized Temporary Loss $ 31,900