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POLICY LIABILITIES - Summary of Discounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 105,979 | $ 121,753 |
Benefits and Expenses | 112,297 | 132,131 |
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 40,474 | 48,363 |
Benefits and Expenses | 41,548 | 50,161 | $ 54,766
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 25,392 | 30,757 |
Benefits and Expenses | 20,695 | 25,257 | 27,419
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 9,226 | 11,240 |
Benefits and Expenses | 24,370 | 29,731 | 31,954
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,968 | 1,914 |
Benefits and Expenses | 1,768 | 1,764 | 1,526
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 6,184 | 6,369 |
Benefits and Expenses | 3,020 | 3,109 | 3,098
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 4,434 | 4,488 |
Benefits and Expenses | 2,405 | 2,422 | 2,445
Critical Care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 12,076 | 12,417 |
Benefits and Expenses | 10,847 | 11,290 | 11,489
Hospital Indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 3,369 | 3,419 |
Benefits and Expenses | 1,907 | 1,943 | 2,074
Dental/Vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 780 | 807 |
Benefits and Expenses | 468 | 478 | 488
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,250 | 1,512 |
Benefits and Expenses | 4,244 | 5,178 | 5,582
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 826 | 467 |
Benefits and Expenses | $ 1,025 | $ 798 | $ 622

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