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Investments Investments (Rollforward of Allowance For Credit Losses) (Details) - Available-for-sale Securities [Member] - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 55 $ 16 $ 31 $ 20
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment 24 7    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (7) (10)    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 7 1    
Corporate Debt Securities [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 43 11 26 17
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment 18 2    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (6) (8)    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 5 0    
Debt Security, Government, Non-US [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 6 4 4 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment 1 4    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (1) 0    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 2 0    
Commercial Mortgage Backed Securities [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 1 1 1 3
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment 0 1    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0 (2)    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 0 1    
Asset-backed securities        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 5 0 $ 0 $ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment 5 0    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0 0    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses $ 0 $ 0