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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 189,737 | $ 191,005
Benefits and Expenses | 234,636 | 235,775
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 74,863 | 75,529
Benefits and Expenses | 83,549 | 84,246
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 50,153 | 50,720
Benefits and Expenses | 50,573 | 50,778
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 16,690 | 16,946
Benefits and Expenses | 52,993 | 53,271
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,466 | 2,375
Benefits and Expenses | 2,871 | 2,787
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 9,467 | 9,481
Benefits and Expenses | 4,621 | 4,636
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,889 | 5,858
Benefits and Expenses | 3,286 | 3,267
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 21,134 | 21,069
Benefits and Expenses | 22,085 | 22,113
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,213 | 5,164
Benefits and Expenses | 3,360 | 3,338
Dental/Vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,194 | 1,208
Benefits and Expenses | 754 | 759
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,309 | 2,322
Benefits and Expenses | 9,379 | 9,433
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 359 | 333
Benefits and Expenses | $ 1,165 | $ 1,147

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