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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, 2024
Mar. 31, 2023
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 $ 75 $ 37
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 30 43
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (8) (3)
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 95 79
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 62 27
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 30 43
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (8) (3)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (5) (2)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 79 69
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 12 10
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 (3) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 15 10
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 1 0
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 $ 1 $ 0