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Future Policy Benefits (Details) (Narrative) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Future Policy Benefits Remeasurement Gain Loss After Reinsurance $ 136  
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 39 $ 85
Life Insurance Product Line [Member] | Americas [Member] | Other Segments    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Changes In Cash Flow Assumptions 31 17
Liability for Future Policy Benefit, after Reinsurance 10,607 8,599
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance (726) (658)
Insurance, Other | Other Segments    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Future Policy Benefits Remeasurement Gain Loss After Reinsurance 20 78
Insurance, Other | Americas [Member] | Other Segments    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Changes In Cash Flow Assumptions 8 22
Liability for Future Policy Benefit, after Reinsurance 6,853 4,456
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ (1,241) $ 0