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Policyholder Account Balances, Future Policy Benefits and Claims - Composition (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Policyholder account balances |  |  |
Policyholder account balances | $ 36,005 | $ 32,542 | $ 27,947
Future policy benefits |  |  |
Reserve for future policy benefits | 7,661 | 7,418 |
Deferred profit liability | 128 | 118 |
Additional liabilities for insurance guarantees | 1,481 | 1,389 |
Other insurance and annuity liabilities | 131 | 192 |
Total future policy benefits | 9,401 | 9,117 |
Policy claims and other policyholders’ funds | 338 | 214 |
Total policyholder account balances, future policy benefits and claims | $ 45,744 | $ 41,873 |

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