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DEFERRED POLICY ACQUISITION COSTS AND INSURANCE EXPENSES - Advertising Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Advertising Costs [Line Items] |  |  |
Advertising expense | $ 188 | $ 204 | $ 229
Aflac Japan |  |  |
Advertising Costs [Line Items] |  |  |
Advertising expense | 58 | 77 | 91
Aflac U.S. |  |  |
Advertising Costs [Line Items] |  |  |
Advertising expense | $ 130 | $ 127 | $ 138

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- Definition Advertising Costs [Line Items] + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 720 -SubTopic 35 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483406/720-35-50-1 + Details
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- Details
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