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Investments Investments (Allowance for Credit Loss Roll Forward) (Details) - Available-for-sale Securities [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 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 $ 111 $ 75 $ 75 $ 37
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase (10)   (42) (45)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0   (9) (10)
Other-than-Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) (1) (1) 11 2
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs 0 6 (1) 6
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 120 68 120 68
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 95 62 62 27
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase (10)   (42) (44)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0   (9) (10)
Other-than-Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) (1) 1 8 0
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs 0 6 (1) 6
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 104 55 104 55
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 15 12 12 10
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0   0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0   0 0
Other-than-Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) 0 0 3 2
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs 0 0 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 15 12 15 12
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 1 1 0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0   0 (1)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0   0 0
Other-than-Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) 0 0 0 0
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs 0 0 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ 1 $ 1 $ 1 $ 1