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Investments Investments (Allowance for Credit Loss Roll Forward) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 161 | $ 120 | $ 161 | $ 120 | $ 132 | $ 98 | $ 111 | $ 75
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded | 25 | 10 | 70 | 42 |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold | (2) | 0 | (4) | (9) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) | 5 | (1) | (3) | 11 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation | 1 | 0 | 0 | 0 |  |  |  |
Allowance for Loan and Lease Losses, Real Estate | 113 | 87 | 113 | 87 | 107 | 93 | 75 | 67
Allowance For Loan and Lease Losses Provision Of Credit Losses | 6 | 12 | 20 | 28 |  |  |  |
Provision (release) | 0 | 0 | 0 | (8) |  |  |  |
Commercial Real Estate |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses, Real Estate | 108 | 87 | 108 | 87 | 103 | 93 | 75 | 67
Allowance For Loan and Lease Losses Provision Of Credit Losses | 5 | 12 | 15 | 28 |  |  |  |
Provision (release) | 0 | 0 | 0 | (8) |  |  |  |
Residential Real Estate |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses, Real Estate | 5 | 0 | 5 | 0 | 4 | 0 | 0 | 0
Allowance For Loan and Lease Losses Provision Of Credit Losses | 1 | 0 | 5 | 0 |  |  |  |
Provision (release) | 0 | 0 | 0 | 0 |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 141 | 104 | 141 | 104 | 112 | 82 | 95 | 62
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded | 25 | 10 | 66 | 42 |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold | (2) | 0 | (4) | (9) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) | 5 | (1) | (3) | 8 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation | 1 | 0 | 0 | 0 |  |  |  |
Asset-backed Securities [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 19 | 15 | 19 | 15 | 19 | 15 | 15 | 12
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded | 0 | 0 | 4 | 0 |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold | 0 | 0 | 0 | 0 |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) | 0 | 0 | 0 | (3) |  |  |  |
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation | 0 | 0 | 0 | 0 |  |  |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 1 | 1 | 1 | 1 | $ 1 | 1 | $ 1 | $ 1
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded | 0 | 0 | 0 | 0 |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold | 0 | 0 | 0 | 0 |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) | 0 | 0 | 0 | 0 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation | 0 | 0 | 0 | 0 |  |  |  |
Debt Security, Government, Non-US [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  | 0 |  |  | $ 0 |  |
Available-for-sale Securities [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense | 0 | 0 | 0 | 1 |  |  |  |
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense | 0 | 0 | 0 | 1 |  |  |  |
Available-for-sale Securities [Member] | Asset-backed Securities [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense | 0 | 0 | 0 | 0 |  |  |  |
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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