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Investments Investments (Allowance for Credit Loss Roll Forward) (Details) - Available-for-sale Securities [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance $ 37 $ 31
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 43 11
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (3) (2)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 2 2
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 79 42
Corporate Debt Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance 27 26
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 43 6
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (3) (1)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 2 2
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 69 33
Asset-backed Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance 10 0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 5
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
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 10 5
Commercial Mortgage Backed Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance 0 1
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 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
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 0 1
Debt Security, Government, Non-US [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance 0 4
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0 (1)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ 0 $ 3