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POLICY LIABILITIES - Summary of Net Earned Premiums Recognized (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | $ 3,456 | $ 3,688
Reinsurance ceded | (69) | (104)
Corporate and other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 165 | 90
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 878 | 1,132
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 605 | 689
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 339 | 399
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 138 | 115
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 325 | 329
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 333 | 309
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 444 | 443
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 185 | 184
Dental/Vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 59 | 53
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | 34 | 39
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net earned premiums | $ 20 | $ 10

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