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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

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