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Future Policy Benefits - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Expected future benefit payments, Undiscounted $ 15,062 $ 13,819  
Expected future gross premiums, Undiscounted 5,858 7,541  
Expected future benefit payments, Discounted 8,365 7,253 $ 6,618
Expected future gross premiums, Discounted 3,681 4,328  
Annuity      
Liability for Future Policy Benefit, Activity [Line Items]      
Expected future benefit payments, Undiscounted 6,011 3,466  
Expected future gross premiums, Undiscounted 0 0  
Expected future benefit payments, Discounted 3,831 2,213 1,288
Expected future gross premiums, Discounted 0 0  
Life      
Liability for Future Policy Benefit, Activity [Line Items]      
Expected future benefit payments, Undiscounted 9,051 10,353  
Expected future gross premiums, Undiscounted 5,858 7,541  
Expected future benefit payments, Discounted 4,534 5,040 $ 5,330
Expected future gross premiums, Discounted $ 3,681 $ 4,328