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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 183,998 | $ 191,005
Benefits and Expenses | 230,333 | 235,775
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 73,299 | 75,529
Benefits and Expenses | 82,368 | 84,246
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 48,031 | 50,720
Benefits and Expenses | 49,223 | 50,778
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 15,926 | 16,946
Benefits and Expenses | 52,692 | 53,271
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,692 | 2,375
Benefits and Expenses | 3,208 | 2,787
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 9,246 | 9,481
Benefits and Expenses | 4,595 | 4,636
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,800 | 5,858
Benefits and Expenses | 3,215 | 3,267
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 20,099 | 21,069
Benefits and Expenses | 20,748 | 22,113
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,005 | 5,164
Benefits and Expenses | 3,058 | 3,338
Dental/Vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,168 | 1,208
Benefits and Expenses | 726 | 759
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,223 | 2,322
Benefits and Expenses | 9,249 | 9,433
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 509 | 333
Benefits and Expenses | $ 1,251 | $ 1,147

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