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Market Risk Benefits (Balances and Changes of Market Risk Benefits) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Market Risk Benefit [Line Items]        
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk $ 233 $ 216    
Market Risk Benefit, Net Amount at Risk 247   $ 258  
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 233 216 249 $ 247
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 241 225 $ 253 $ 263
Market Risk Benefit, Interest Expense 8 9    
Market Risk Benefit, Attributed Fee Collected 19 19    
Market Risk Benefit, Benefit Payment 0 1    
Market Risk Benefit, Increase (Decrease) from Interest Rate Change (3) (54)    
Market Risk Benefit, Increase (Decrease) from Equity Market Change (39) (25)    
Market Risk Benefit, Increase (Decrease) from Volatility 0 (5)    
Market Risk Benefit, Increase (Decrease) from Other Assumption (13) (11)    
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected 13 12    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax (8) (9)    
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk 233 216    
Market Risk Benefit, Reinsurance Recoverable, after Allowance 0 0    
Market Risk Benefit, Net Amount at Risk $ 1,285 $ 1,375    
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age 71 years 71 years    
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption $ 3 $ 16