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Future Policy Benefits - Schedule of Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Traditional Life    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract]    
Expected future benefit payments $ 2,843 $ 2,996
Expected future gross premiums 978 1,116
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract]    
Expected future benefit payments 2,073 1,984
Expected future gross premiums 728 772
Immediate Annuities    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract]    
Expected future benefit payments 3,212 3,227
Expected future gross premiums 0 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract]    
Expected future benefit payments 1,392 1,313
Expected future gross premiums 0 0
PRT    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract]    
Expected future benefit payments 8,449 5,445
Expected future gross premiums 0 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract]    
Expected future benefit payments 5,470 3,605
Expected future gross premiums $ 0 $ 0