POLICY LIABILITIES - Schedule of Changes in Other Policyholders' Funds (Details) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended | ||
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Sep. 30, 2026 |
Dec. 31, 2025 |
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| Policyholder Account Balance [Line Items] | ||||
| Other deposit type reserves | $ 375 | $ 293 | ||
| Other policyholders’ funds | 5,446 | 5,445 | ||
| Aflac Japan | Fixed Annuity | ||||
| Policyholder Account Balance [Line Items] | ||||
| Beginning balance | [1] | 5,152 | 5,221 | |
| Premiums received | [1] | 66 | 97 | |
| Transfers from WAYS conversions | [1] | 288 | 307 | |
| Surrenders and withdrawals | [1] | (55) | (64) | |
| Benefit payments | [1] | (389) | (513) | |
| Interest credited | [1] | 35 | 49 | |
| Foreign currency translation and other | [1] | (26) | 55 | |
| Ending balance | [1] | $ 5,071 | $ 5,152 | |
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- Definition Policyholder Account Balance, Foreign Currency Translation and Other No definition available.
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- Definition Amount of interest expense for allocation to policyholder account balance. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount due to policyholders for funds held that are returnable under the terms of insurance contracts, classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cash outflow to policyholder account balance from benefit payment. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of increase (decrease) in liability for policyholder account balance from change, classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cash inflow to policyholder account balance from premium received. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of decrease in liability for policyholder account balance from contract redemption and withdrawal of funds. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of liability due to policyholder for deposit held under long-duration contract issued by insurance entity. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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