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FUTURE POLICY BENEFITS - Schedule of Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
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Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, Undiscounted | $ 21,789 | $ 20,043
Expected future gross premiums, Undiscounted | 14,649 | 9,516
Expected future benefit payments, Discounted | 11,676 | 10,365
Expected future gross premiums, Discounted | 8,507 | 3,509
Annuity |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, Undiscounted | 11,414 | 7,991
Expected future gross premiums, Undiscounted | 0 | 509
Expected future benefit payments, Discounted | 6,877 | 4,929
Expected future gross premiums, Discounted | 0 | 0
Life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, Undiscounted | 10,375 | 12,052
Expected future gross premiums, Undiscounted | 14,649 | 9,007
Expected future benefit payments, Discounted | 4,799 | 5,436
Expected future gross premiums, Discounted | $ 8,507 | $ 3,509

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