DESCRIPTION OF THE PLAN - Additional Information (Details) - EBP 004 - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
EBP, Description of Plan [Line Items]
EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage	75.00%
EBP, Aggregate Limit Prescribed by IRS for Participants Under Age 50	$ 23,500
EBP, Aggregate Limit Prescribed by IRS for Participants Aged 50-59 or 64	31,000
EBP, Aggregate Limit Prescribed by IRS for Participants Age 60-63	$ 34,750
EBP, Participant Contribution, Automatic, Deferral Rate	6.00%
EBP, Participant Contribution, Automatic Annual Increase, Deferral Rate	1.00%
EBP, Participant Contribution, Maximum, Deferral Rate	10.00%
EBP, Employer Contribution, Matching Percentage	100.00%
EBP, Employer Nonelective Contribution	4.00%
EBP, Participant Contribution, Vesting Percentage	100.00%
EBP, Forfeited Nonvested Account	$ 96,000	$ 187,000
EBP, Forfeited Nonvested Account, Decrease from Employer Contribution	1,957,000
EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount	$ 1,000
EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage	50.00%
EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount	$ 50,000
EBP, Note Receivable from Participant, Account, Maturity Period for General Purpose Loans	5 years
EBP, Note Receivable from Participant, Account, Maturity Period for Loans Made to Purchase Principal Residence	10 years
EBP, Note Receivable from Participant, Account, Additional Interest	2.00%
EBP, Change in Net Asset Available for Benefit, Increase from Administrative Credit	$ 401,027
EBP, Unused Administrative Revenue Credit	$ 283,000	$ 194,000
Aflac Incorporated Common Stock
EBP, Description of Plan [Line Items]
EBP, Investment, Number of Shares	1.7	1.9
EBP, Net Asset Value per Share or Unit	$ 110.27	$ 103.44
EBP, Dividends Received	$ 4,000,000.0
Fidelity
EBP, Description of Plan [Line Items]
EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense	129,000
EBP, Change in Net Asset Available for Benefit, Increase from Administrative Credit	$ 530,000
Minimum
EBP, Description of Plan [Line Items]
EBP, Employer Contribution, Participant Compensation Matched, Percentage	1.00%
Maximum
EBP, Description of Plan [Line Items]
EBP, Employer Contribution, Participant Compensation Matched, Percentage	4.00%

EBP, Aggregate Participant Contribution Limit Prescribed by IRS for Participants Age 50-59 or 64 and Over

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- Definition

EBP, Aggregate Participant Contribution Limit Prescribed by IRS for Participants Age 60-63

+ References

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- Definition

EBP, Aggregate Limit Prescribed by IRS for Participants Under Age 50

+ References

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- Definition

EBP, Change in Net Asset Available for Benefit, Increase from Administrative Credit

+ References

No definition available.

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- Definition

EBP, Dividends Received

+ References

No definition available.

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- Definition

EBP, Employer Contribution, Participant Compensation Matched, Nonelective, Percentage

+ References

No definition available.

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- Definition

EBP, Note Receivable from Participant, Account, Additional Interest

+ References

No definition available.

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- Definition

EBP, Note Receivable from Participant, Account, Maturity Period for General Purpose Loans

+ References

No definition available.

+ Details

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- Definition

EBP, Note Receivable from Participant, Account, Maturity Period for Loans Made to Purchase Principal Residence

+ References

No definition available.

+ Details

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- Definition

EBP, Participant Contribution, Automatic, Deferral Rate, Annual Increase

+ References

No definition available.

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- Definition

EBP, Participant Contribution, Automatic, Deferral Rate, Annual Increase Maximum

+ References

No definition available.

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- Definition

EBP, Participant Contribution, Vesting Percentage

+ References

No definition available.

+ Details

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- Definition

EBP, Revenue Credit Account

+ References

No definition available.

+ Details

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- Definition

Amount of decrease in net asset available for benefit from administrative expense incurred by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule III))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
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-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477063/962-205-45-7

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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 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

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- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from employer contribution.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

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-Topic 962
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-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
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-Subparagraph (SX 210.6A-04(5)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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- Definition

Number of shares or units of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
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-Paragraph b
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-Publisher DOL-EBSA

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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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- Definition

Net asset value per share or per unit of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

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- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

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- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

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- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

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