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STATUTORY ACCOUNTING AND DIVIDEND RESTRICTIONS - Net Income (Loss) Based on Statutory Accounting Practices (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Aflac |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Net income (loss), statutory accounting practices | $ 1,106 | $ 1,134 | $ 1,146
CAIC |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Net income (loss), statutory accounting practices | (121) | (69) | (30)
TOIC |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Net income (loss), statutory accounting practices | (27) | (35) | (27)
Aflac New York |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Net income (loss), statutory accounting practices | $ 54 | $ 67 | $ 83

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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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