XML 72 R61.htm IDEA: XBRL DOCUMENT
v3.25.3

INVESTMENTS - Securities Lending Transactions Accounted for as Secured Borrowings (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | $ 5,429 | $ 2,037
Gross amount of recognized liabilities for securities lending |  | 5,429 | 2,037
Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 4,307 | 1,027
Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 39 | 34
Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 186 | 193
Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 897 | 783
Maturity Overnight and Continuous |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 1,122 | 1,010
Maturity Overnight and Continuous | Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 0 | 0
Maturity Overnight and Continuous | Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 39 | 34
Maturity Overnight and Continuous | Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 186 | 193
Maturity Overnight and Continuous | Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 897 | 783
Maturity up to 30 Days |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 1,946 | 1,027
Maturity up to 30 Days | Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 1,946 | 1,027
Maturity up to 30 Days | Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity up to 30 Days | Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity up to 30 Days | Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | $ 0
Maturity 30 to 90 Days |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 2,361 |
Maturity 30 to 90 Days | Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 2,361 |
Maturity 30 to 90 Days | Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 |
Maturity 30 to 90 Days | Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 |
Maturity 30 to 90 Days | Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | $ 0 |
[1] | The related loaned security, under the Company's U.S. securities lending program, can be returned to the Company at the transferee's discretion; therefore, they are classified as Overnight and Continuous.

X
- Definition Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral and funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481395/860-30-55-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 + Details
Name: | us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before effects of master netting arrangements, of financial assets loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and financial assets transferred other than securities that qualify as secured borrowings. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481395/860-30-55-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -SubTopic 30 -Topic 860 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 + Details
Name: | us-gaap_SecuritiesLoanedIncludingNotSubjectToMasterNettingArrangementAndAssetsOtherThanSecuritiesTransferred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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/2003/role/exampleRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481395/860-30-55-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 + Details
Name: | us-gaap_TransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_PublicUtilityBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=afl_BanksAndFinancialInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityOvernightAndOnDemandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityUpTo30DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_Maturity30To90DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |