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POLICY LIABILITIES - Summary of Interest Expense Related to Insurance Contracts Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 629 | $ 654 | $ 1,270 | $ 1,367
Net earned premiums, principally supplemental health insurance | 3,573 | 3,764 | 7,262 | 7,844
Reinsurance ceded | (103) | (105) | (210) | (221)
Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Net earned premiums, principally supplemental health insurance | 2,064 | 2,334 | 4,234 | 4,959
Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Net earned premiums, principally supplemental health insurance | 1,425 | 1,394 | 2,853 | 2,807
Corporate and other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Net earned premiums, principally supplemental health insurance | 84 | 36 | 175 | 82
Cancer | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 276 | 296 | 561 | 626
Net earned premiums, principally supplemental health insurance | 1,054 | 1,193 | 2,149 | 2,528
Medical and other health | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 72 | 73 | 143 | 151
Net earned premiums, principally supplemental health insurance | 672 | 735 | 1,377 | 1,563
Life insurance | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 130 | 136 | 263 | 285
Net earned premiums, principally supplemental health insurance | 390 | 459 | 812 | 983
Life insurance | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 10 | 8 | 19 | 17
Net earned premiums, principally supplemental health insurance | 115 | 99 | 228 | 197
Accident | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 6 | 5 | 12 | 12
Net earned premiums, principally supplemental health insurance | 322 | 329 | 652 | 665
Disability | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 10 | 9 | 18 | 19
Net earned premiums, principally supplemental health insurance | 318 | 295 | 627 | 591
Critical Care | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 86 | 86 | 173 | 172
Net earned premiums, principally supplemental health insurance | 439 | 439 | 882 | 885
Hospital Indemnity | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 10 | 10 | 20 | 20
Net earned premiums, principally supplemental health insurance | 182 | 183 | 367 | 368
Dental/Vision | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 3 | 3 | 6 | 7
Net earned premiums, principally supplemental health insurance | 53 | 50 | 107 | 99
Other | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 20 | 21 | 42 | 45
Net earned premiums, principally supplemental health insurance | 38 | 42 | 77 | 85
Other | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 6 | 7 | 13 | 13
Net earned premiums, principally supplemental health insurance | $ 9 | $ 9 | $ 19 | $ 19

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