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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
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