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Future Policy Benefits - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future benefit payments, Undiscounted $ 20,029 $ 15,062
Expected future gross premiums, Undiscounted 5,381 5,858
Expected future benefit payments, Discounted 10,811 8,365
Expected future gross premiums, Discounted 3,248 3,681
Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future benefit payments, Undiscounted 11,444 6,011
Expected future gross premiums, Undiscounted 0 0
Expected future benefit payments, Discounted 6,563 3,831
Expected future gross premiums, Discounted 0 0
Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future benefit payments, Undiscounted 8,585 9,051
Expected future gross premiums, Undiscounted 5,381 5,858
Expected future benefit payments, Discounted 4,248 4,534
Expected future gross premiums, Discounted $ 3,248 $ 3,681