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Future Policy Benefits - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Jun. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future benefit payments, Undiscounted $ 19,295 $ 15,906
Expected future gross premiums, Undiscounted 5,482 14,649
Expected future benefit payments, Discounted 10,448 8,103
Expected future gross premiums, Discounted 3,259 8,507
Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future benefit payments, Undiscounted 10,620 5,531
Expected future gross premiums, Undiscounted 0 0
Expected future benefit payments, Discounted 6,245 3,384
Expected future gross premiums, Discounted 0 0
Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future benefit payments, Undiscounted 8,675 10,375
Expected future gross premiums, Undiscounted 5,482 14,649
Expected future benefit payments, Discounted 4,203 4,719
Expected future gross premiums, Discounted $ 3,259 $ 8,507