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Future Policy Benefits (Details) (Narrative) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Future Policy Benefits Remeasurement Gain Loss After Reinsurance   $ 136
Liability for Future Policy Benefit, Adverse Development, Expense $ 117  
Life Insurance Product Line [Member] | Other Segments    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Future Policy Benefits Remeasurement Gain Loss After Reinsurance 183 39
Life Insurance Product Line [Member] | Americas [Member] | Other Segments    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Changes In Cash Flow Assumptions 29 31
Liability for Future Policy Benefit, after Reinsurance 12,664 10,607
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance (834) (726)
Insurance, Other | Other Segments    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Future Policy Benefits Remeasurement Gain Loss After Reinsurance 24 20
Insurance, Other | Americas [Member] | Other Segments    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Changes In Cash Flow Assumptions 0 8
Liability for Future Policy Benefit, after Reinsurance 8,090 6,853
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ (1,749) $ (1,241)