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Market Risk Benefits (Balances and Changes of Market Risk Benefits) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Market Risk Benefit [Line Items]        
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk $ 219 $ 233    
Market Risk Benefit, Net Amount at Risk 238   $ 223  
Insurance, Other | Americas [Member] | Other Segments        
Market Risk Benefit [Line Items]        
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 219 233 206 $ 249
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 220 241 $ 209 $ 253
Market Risk Benefit, Interest Expense 6 8    
Market Risk Benefit, Attributed Fee Collected 18 19    
Market Risk Benefit, Benefit Payment 0 0    
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption 0 3    
Market Risk Benefit, Increase (Decrease) from Interest Rate Change 9 (3)    
Market Risk Benefit, Increase (Decrease) from Equity Market Change (32) (39)    
Market Risk Benefit, Increase (Decrease) from Volatility 1 0    
Market Risk Benefit, Increase (Decrease) from Other Assumption (7) (13)    
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected 16 13    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax (1) (8)    
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk 219 233    
Market Risk Benefit, Reinsurance Recoverable, after Allowance 0 0    
Market Risk Benefit, Net Amount at Risk $ 1,218 $ 1,285    
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age 72 years 71 years